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There are verbs that, when paired with certain adverbs, can have a distinctly different meaning. For example,
I looked up the word in the dictionary.
The phrase looked up functions as a verb with a distinct meaning than looked in a sentence like
I looked ridiculous.
In all of these two-word verb examples I can think of, they become a single word when used as a noun or adjective:
The software performs millions of lookups per second.
Is there a term for these verb+adverb pairs, and, if so, what is it?
Additional examples: back up, run off, hang out
Once upon a time, I though these were called verbals, but that was wrong. The term verb phrase is not quite right either; a verb phrase generally encompasses additional modifiers, objects, etc.