Trim
Old English trymman, trymian ‘make firm, arrange’, of which the adjective appears to be a derivative. The word's history is obscure; current verb senses date from the early 16th century when usage became frequent and served many purposes: this is possibly explained by spoken or dialect use in the Middle English period not recorded in extant literature.
wiktionary
From Middle English trimen, trymen, trümen, from Old English trymman(“to make firm; strengthen”), from Proto-Germanic *trumjaną(“to make fast; strengthen”), from Proto-Germanic *trumaz(“firm; strong; sound”).
etymonline
trim (v.)
mid-15c., probably from Old English trymian, trymman "strengthen, fortify, confirm; comfort; incite; set in order, arrange, prepare, make ready; become strong," from trum "strong, stable," from Proto-Germanic *trum-, from PIE *dru-mo-, suffixed form of root *deru- "be firm, solid, steadfast." Examples in Middle English are wanting.
Original sense is preserved in nautical phrase in fighting trim (see trim (n.)); where the verb meant "distribute the load of a ship so she floats on an even keel" (1570s). Meaning "make neat by cutting" is first recorded 1520s; that of "decorate, adorn" is from 1540s. Sense of "reduce" is attested from 1966.
trim (n.)
"state of being prepared," 1580s, nautical jargon, "fit for sailing," from trim (v.). From 1570s as "ornament, decoration;" the meaning "visible woodwork of a house" is recorded from 1884; sense of "ornamental additions to an automobile" is from 1922. Slang meaning "a woman regarded as a sex object" is attested from 1955, American English.
trim (adj.)
c. 1500, "neatly or smartly dressed," probably ultimately from trim (v.) or from related Old English trum "firm, fixed, secure, strong, sound, vigorous, active." Related: Trimly; trimness.
