Definition of pipsqueak noun from the Oxford Advanced Learner's Dictionary

 

pipsqueak

 noun
noun
BrE BrE//ˈpɪpskwiːk//
 
; NAmE NAmE//ˈpɪpskwiːk//
 
(old-fashioned, informal)
 
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a person that you think is unimportant or does not deserve respect because they are small or young Word Origin early 20th cent.: symbolic and imitative.
See the Oxford Advanced American Dictionary entry: pipsqueak