(formal, dated) motorcycle

a biceps brachii muscle

kill two birds with one stone, do one task and finish two or more goals (literally, “one stone, two birds”)

three-legged race / (idiomatic) cooperating and working together to accomplish a task

(obsolete) round the clock / (obsolete) all the time

thirty-first day of the month

a cackling goose

the Thirty-Six Stratagems

eating the first product of the season make one live longer / a wonder lasts but nine days

The chestnut or burr rose: a species of rose native to east Asia, Rosa roxburghii. Member of sub-genus Platyrhodon.