Trusty
来自Big Physics
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wiktionary
From Middle English trusty, tristy, tresty, equivalent to trust + -y.
etymonline
trusty (adj.)
early 13c., "trusting," from trust (n.) + -y (2). Old English expressed this idea by treowful. Meaning "reliable, to be counted on" is from early 14c. The noun meaning "trustworthy person" is from 1570s; specifically as "a prisoner granted special privileges as reward for good conduct" by 1855.
