1823, from squeak (n.) + -y (2). Squeaky clean in figurative sense is from 1972, probably from advertisements for dishwashing liquid. Related: Squeakily; squeakiness.
adjective suffix, "full of or characterized by," from Old English -ig, from Proto-Germanic *-iga- (source also of Dutch, Danish, German -ig, Gothic -egs), from PIE -(i)ko-, adjectival suffix, cognate with elements in Greek -ikos, Latin -icus (see -ic). Originally added to nouns in Old English; used from 13c. with verbs, and by 15c. even with other adjectives (for example crispy).
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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;
