stairs used in emergencies

state of emergency (unusually difficult or dangerous situation)

Synonym of 三角錐 (sankakusui, “triangular pyramid”); a tetrahedron

hexahedron

Kyūjitai form of 立方半八面体: cubohemioctahedron

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