1736 Canting Dictionary / T / TRIM [thing]
Dress. In a sad Trim; dirty, undress'd. A Trim Lad; A spruce, neat, well trick'd Man.
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Entry taken from 1736 Canting Dictionary, by Nathan Bailey.
Trim in the 1811 Vulgar Tongue
Also see examples in Canting Songs and Slang Rhymes collected by John S. Farmer (1896).