Plump has 13 different meanings across 4 categories:
the sound of a sudden heavy fall
"The plump! The box tumbled down from the top shelf and landed on the floor."
The sound of a sudden heavy fall.
"The old oak tree was so plump with moss that it looked like a giant, fuzzy green ball."
A knot or cluster; a group; a crowd.
In plain English: A plump is an extra amount of something, usually food or money, that you get as part of your regular share.
"She served three plumps on her plate along with a side salad."
set (something or oneself) down with or as if with a noise
"He planked the money on the table"
"He planked himself into the sofa"
To grow plump; to swell out.
"The ripe fruit plumped from the branch and landed softly on the ground below."
To drop or fall suddenly or heavily, all at once.
In plain English: To plump something is to make it softer and rounder by adding fat or padding.
"The baker plumped up the dough before letting it rise again."
Usage: Use the verb plump to describe something dropping suddenly with force, such as leaves falling from a tree in autumn. This meaning is distinct from its more common adjective form describing someone who is chubby or full-figured.
sufficiently fat so as to have a pleasing fullness of figure
"a chubby child"
"pleasingly plump"
Having a full and rounded shape; chubby, somewhat overweight.
"The little girl wore a plump sweater that made her look even rounder than she already was."
In plain English: Plump means having a soft, round shape because you are slightly fat but still healthy and well-fed.
straight down especially heavily or abruptly
"the anchor fell plump into the sea"
"we dropped the rock plump into the water"
Directly; suddenly; perpendicularly.
"The ball plumped into the water, creating an immediate splash right where it hit."
In plain English: Plump means to make something rounder and fuller by adding more of it.
"The door opened plump into his face."
The word plump comes from the Middle Dutch and Middle Low German words for "heavy" or "clumsy." It entered English in this form, carrying its original sense of being full and rounded.