happy birthday

(literally) a short-lived regime / being in power over a very short time

Have a nice day!

(shogi) repetition of the same moves

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

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

(Classical Japanese grammar) a verbal conjugation class with the following inflections: -e/-e/-u/-uru/-ure/-e[yo]

(Classical Japanese grammar) a verbal conjugation class which has the following inflections: -i/-i/-u/-uru/-ure/-i[yo]

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

(algebra, computing) binary operator