Making a high-pitched, thin sound like a door hinge or a mouse, or too clean and innocent in an unrealistic way.
From 'squeak,' an onomatopoeia (sound imitation) that dates back to the 1600s. The adjective form emerged to describe anything producing such sounds.
The phrase 'squeaky clean' originated in the 1950s when it was used to advertise soap, but it became slang for someone suspiciously perfect or innocent—showing how a literal description of cleanliness became about moral judgment!
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