(obsolete or only in compounds) person of letters; intellectual; scholar; fighter; officer; official
(xiangqi) advisor, a piece labeled with the characters 士 (black) and 仕 (sĩ, red)

adj

(archaic) intelligent; wise; well educated

verb

(colloquial) Short for sĩ diện (“to be egoistic, to be snobbish”).

sải
noun

arm span
(units of measure) fathom

xảy
verb

(usually of something bad and used with “ra”) to occur; to happen (by itself)

adv

(archaic) suddenly