be useful, serve / be valid, be usable (e.g. a coupon at a cash register)

become blunt / decline in ability or energy, lose one's edge

become blunt / decline in ability or energy, lose one's edge / lose skill, decline in competence, get rusty

blade, edged tool, often a knife

毛舌: black hairy tongue

毛氈: felt

Said when reflecting on something remarkable.

(colloquial) jeez!, used to express frustration against the addressee; compare use of English already

already / already the time to do so. shortly, soon. / (chiefly in the negative) any more / Used in exasperation: compare English already / more, further

dead / one who is preoccupied with money, power, etc.