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squeaky (adj.)

1823, from squeak (n.) + -y (2). Squeaky clean in figurative sense is from 1972, probably from advertisements for dishwashing liquid. Related: Squeakily; squeakiness.

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Definitions of squeaky

squeaky (adj.)
having or making a high-pitched sound such as that made by a mouse or a rusty hinge;
Synonyms: screaky / screechy / squeaking / squealing
From wordnet.princeton.edu