"mental inclination," 1570s, from the adj., "not straight" (late 14c.), originally pp. of bend. The verb meaning "directed in a course" is from 1690s. Phrase bent out of shape "extremely upset" is 1960s Air Force and college student slang.
"stiff grass," O.E. beonet, from W.Gmc. *binut- "rush, marsh grass" (cf. Ger. binse "rush, reed"), of unknown origin. An obsolete word, but surviving in place names (cf. Bentley, from O.E. Beonet-leah).
The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D. Copyright (C) 2007 by HarperCollins Publishers. Cite This Source
Idioms and Phrases with bent on
bent upon. Determined, resolved, as in Jamie is bent on winning the math prize. This phrase, first recorded in 1762, always uses the past participle of the verb bend in the sense of “tend toward.”