wimp - definition and synonyms

verb 

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/wɪmp/
present tense
I/you/we/theywimp
he/she/itwimps
present participlewimping
past tensewimped
past participlewimped

phrasal verb

wimp out

[intransitive]
present tense
I/you/we/theywimp out
he/she/itwimps out
present participlewimping out
past tensewimped out
past participlewimped out
informal
to decide not to do something because you are frightened or not confident