Whimper

google

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early 16th century: from dialect whimp ‘to whimper’, of imitative origin.

wiktionary

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From dialectal whimp(“to whine”) +‎ -er(frequentative suffix). Compare German wimmern(“to whimper, whine”).

etymonline

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whimper (v.)

1510s, probably of imitative origin, or from German wimmern "to whimper, moan." Related: Whimpered; whimpering. The noun is first recorded c. 1700.