|informal See also wimp out a feeble ineffective person|
|[C20: of unknown origin]|
|informal (intr, adverb) to fail to do or complete something through fear or lack of conviction|
|WIMP (wĭmp) Pronunciation Key
Short for weakly interacting massive particle. Any of various hypothetical particles, some predicted by certain theories such as supersymmetry, which interact with other particles by the force of gravity alone. WIMPs are considered by some scientists to be candidates for the dark matter that makes up much of the mass of the universe.
wimp out (of (sth)) definition