rat hole
 n.— «The intervening space between tire and wheel well is sometimes called the dead cat hole, according to Peter Davis, director of interior design for global compact utility vehicles at G.M. More colorful and less formal terms come in handy in the studio. Mr Davis supplied rat holes, which, he said, were the “small unwanted, usually triangular holes that result from parts coming together.”» —“Body Language: How to Talk the Designers’ Talk” by Phil Patton New York Times Apr. 1, 2007. (source: Double-Tongued Dictionary)

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