Etymology
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chinch (n.)

"bedbug," 1620s, from Spanish/Portuguese chinche (diminutive chinchilla) "bug," from Latin cimicem (nominative cimex) "bedbug," a word of uncertain origin. Related: Chinch-bug.

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Definitions of chinch

chinch (n.)
bug of temperate regions that infests especially beds and feeds on human blood;
Synonyms: bedbug / bed bug / Cimex lectularius
From wordnet.princeton.edu