Example:
Mom came over and [...] on the bed, making my head bounce on the pillow.
Example:
Mom came over and [...] on the bed, making my head bounce on the pillow.
Mom came over and plopped on the bed, making my head bounce on the pillow.
Or dropped.
- To let the body drop heavily: Exhausted, I plopped into the armchair.
Source: The American Heritage® Dictionary
Mum came over and plonked herself on the bed, making my head bounce on the pillow
- (often foll by down) to drop or be dropped, esp heavily or suddenly: he plonked the money on the table.
Source: www.thefreedictionary.com
I would use flump because it sounds like a noise the action might cause, and evokes both slump and flop simultaneously. Oddly, it appears Flump is also the name of a British marshmallow candy, which might confuse candy aficionados.
Flump v 1: To move or fall suddenly or heavily
The word "slump", that is, to fall swiftly, far and suddenly, comes to mind here. It may be a bit strong, depending on the exact context. To "slump" is very near in meaning to "collapse" and, when said of people or other living animals in a context like yours, is wont to bespeak someone very tired, exasperated (maybe even near to a nervous breakdown!) or undergoing a medical crisis like faint, heart attack, cerebral ischaemia, having swallowed a cyanide suicide pill or having been shot through the window by a disgruntled neighbour ...... (let your imagination run wild). So, if Mum wasn't very tired or being picked off by violent locals, look for something else. However, slump, IMO is a wonderful example of onomatopoeia.
Answerers have offered plop, plonk, plunk, and slump, but not the very similarly spelled verb that I think conveys the heaviness of the action most accurately. From Merriam-Webster's Eleventh Collegiate Dictionary (2003):
plump vb 1 : to drop, sink, or come in contact suddenly or heavily {plumped down in the chair}
Depending on how plump your mom is, when she plumps down on your bed, your head may very well bounce on your pillow.
I prefer flopped - it gives an image of someone almost exhausted vaguely aiming for the bed with little thought of controlling the impact or preventing their limbs flailing.
plonked and plopped as have been suggested previously give me the imagery of people who are actually aiming for the bed in a controlled manner, but with little thought as to the weight of the impact.
Depends what you are trying to convey in the story IMHO.
Plunk: (from TFD)
- To drop or fall abruptly ; plunked onto the couch with a sigh of relief.
I would think slumped would be appropriate here.
If you desire an edge of violence or disruption, you might try flounce down. From the verb definition of flounce in the OED:
flounce, v. 1.a. intr. To go with agitated, clumsy, or violent motion; to dash, flop, plunge, rush. Also with away, out, etc.
An example is given from Thackeray, Newcomes II. xxxiii. 299: "Rosey's mamma flouncing down on a chair."
You could say
The world's best authors would make up their own word if one didn't exist. Go for it, make one up, if it is onomatopoeic enough we will all know what you mean.
(Lewis Carrol, Shakespeare, Dr Seuss, Tolkien etc)