off-stage (adj.)youdaoicibaDictYouDict[off-stage 词源字典]
also offstage, 1915, from off (adv.) + stage (n.).[off-stage etymology, off-stage origin, 英语词源]
slapstick (n.)youdaoicibaDictYouDict
also slap-stick, originally (1896) a device consisting of two sticks fastened together so as to slap loudly when a clown or actor hits somebody with it, or to make a sound-effect offstage; from slap and stick (n.). As an adjective by 1906. Meaning "farcical physical comedy, horseplay" (1916) is short for slapstick comedy or humor.