How does the "be-" prefix change the words to which it is applied? How did it come about?

Question

What does the be- prefix change when applied to adjectives and verbs? There are many such words that seemed to be coined of this process, for example:

behold, beget, befallen, beridden, bedazzled, bedevil, between, befluxed

That's just off the top of my head; I am positive that I've missed plenty more. How does (or did) be- change the "root" of each word? (Scare quotes, because many of these "roots" don't seem to be actual words in modern English).

And also, I'm aware that words typically often gain different meanings, sometimes vastly away from their original sense, in the process of word evolution; in addition to asking what be- prefixation means in the present day, I'm also wondering about what the first coiners of these words, many from Old English, would have been thinking as they coined them, and if the be- prefix evolved from a "natural" preposition.

Answer 1

The formation of verbs in many Indo-European languages follows the following rule

    prefix + root verb

Examples

• English incoming, outgoing
• German einkommen (income), ausgehend (outgoing)
• Latin inīre (to come in), exīre (to go out)

German for instance still follows this system very closely and has a small number of ubiquitous prefixes which fall into two categories:

1. The so called separable¹ prefixes (ab- "off", an- "on", auf- "up", aus- "out", ein- "in" etc.), which indicate an ongoing action, a movement or a direction.
2. And the so called inseparable¹ prefixes: (be- (be), ent-, er-, ge-, mis-, ver- and zer-) which indicate a completed action (differentiated according to the type of outcome: neutral, successful, failed...).

The English be- prefix is clearly the same as the German be- and is therefore a remnant of its Germanic ascendancy.

It is actually of the same origin as the verb to be which linguists have traced back, through Proto Germanic to the reconstituted Proto Indo European root *bheu-, *bhu- meaning "to grow", "to turn into" or " to become"².

Ultimately most of the English words starting with a "be-" can be traced back to this notion of "to turn into"³.

The general form is:
   be + [quality]
and the corresponding meaning is:
   to turn into + [quality].

Let's illustrate all this theory with a few simple examples:

• to befriend somebody => to turn somebody into a friend.
• to beget something => to make something supplied, produced.
• to besot somebody (besotted) => to turn somebody into a sot (a dummy).
• to bewitch somebody => to make somebody possessed by a spell.
• to bedazzle somebody => to make him confused (see also bewilder)

These ones are slightly more difficult:

• to behold: the original meaning of to hold (OE healdan, German halten) is to keep. But to keep by actually keeping an eye on, to watch over. => So to behold is to make something watched.
• to bedevil someone => to make someone feel like in Hell.
• to believe something => to make something dear (loved). See also German glauben (ge + lieben) as well as Dutch geloven.
• to belong to someone => to make something go along with somebody.

As usual there are a few exceptions or look-alikes that don't fit into the template

• to behead => sometimes the "be" is categorised as privative but you can also interpret it as "turn into a head (and not much else)". The question being what do you sever: the head or the body ?
• between. It is not a verb. The "be" is akin to "by" and the "tween" part is akin to "two".

But their existence is not sufficient to belie the general theory outlined above.

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Note 1:
^{German verbs starting with a separable prefix form their past participle by inserting a "ge-" between the prefix and the root. For instance:
    Infinitve aus-gehen "to go out" => past participle aus-ge-gangen "gone out".
The meaning of "ge-" in this role is actually the same as the meaning of "ge-" taken as an inseparable prefix: it indicates that an action is complete.
Inseparable prefixes already have the meaning of a completed action. Therefore the past participle form of the verbs starting with this kind of prefixes does not need an additional "ge-".}
Note 2:
<sup>The Proto Indo European root *bheu-, *bhu- also enters into the composition of the German equivalent of to be:
- ich bin "I am" and
- du bist "you are".</sup>
Note 3:
^{In German the past participle of the verb kennen (to know) is gekannt (known) but it has a close relative in bekannt, which also means "known".
However, bekannt is the past participle of "bekennen" which means "to confess, to acknowledge" - that is to say "to turn into a known thing" whereas the simple un-prefixed kennen verb means "to known".
In English, there used to be a similar word beknown and we still use unbeknownst (see German unbekannt - credits @OregonGhost's comment).}

Answer 2

The prefix be- is an unstressed form of "by" meaning "at, on, near, around, about". It has several meanings, but the more abundant is the "about, around" sense. So, to talk about someone is to "betalk" them; to cry about something is to "becry" it, etc.

Answer 3

The be- forefast (prefix), for me, is one of the funnest to play with. It often changes the meaning of the root word in an unforetellable way.

A couple of clarifications. The be- mostly acts as an intensifier. For byspel, the verb to head means to lop off the upper part (OED verb, #5): the willow is headed every three or four years. The verb to behead is merely intensifying this meaning but is normally only used with executions.

The trick is often to know which meaning is being intensified.

To reword what Alain said and put it in a different way, it can take a noun or adjective and make it into a verb. Thus if I want a verb meaning to color something purple, it would be bepurple.

To besot is a byspel of turning a noun into a verb. It means to be a fool, act a fool, be made of a fool of thus besotted (also besotten) means drunk, stupefied, or strongly infatuated with (OED): he became besotted with a local barmaid. From be- + sot (from OE sott — foolish (adj), fool (n)). Oddly enuff, the verb in ME was assoten, assotten.

Bename can mean to name, declare, or to nominate (nominate is from Latin nominare, to name).

It also turns an intransitiv verb into a transitiv one. The archaic bedive means to submerge, dip, or drown something. Thus bedoven means drenched, drowned. I was bedoven with sweat.

It's a fun forefast!