Etymology
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bug off (v.)
"leave quickly," by 1956, perhaps from bugger off (see bugger (v.)), which chiefly is British (by 1920s) but was picked up in U.S. Air Force slang in the Korean War. Also see bug (v.3). To bug out "leave quickly, scram" is from 1953.
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off-duty (adj.)

"not employed or occupied with one's normal work," 1743, from off (prep.) + duty.

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rip-off (n.)

"an act of fraud, a swindle," 1969, from verbal phrase rip off "to steal or rob" (c. 1967) in African-American vernacular, from rip (v.) + off (adv.). Rip was prison slang for "to steal" since 1904, and was also used in this sense in 12c. The specific meaning "an exploitative imitation" is from 1971, also "a plagiarism." Related: Ripped-off.

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set off (v.)
verbal phrase; see set (v.) + off (adv.). From 1590s as "make prominent by contrast," 1610s as "adorn." Intransitive sense of "start on a journey" is from 1774. Meaning "separate from contect" (in typography) is from 1824; sense of "ignite, discharge, cause to explode" is from 1810.
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turn-off (n.)
"something that dampens one's spirits" recorded by 1971 (said to have been in use since 1968), from verbal phrase turn off "stop the flow of" (1850), from turn (v.) + off (adv.). Turn-off (n.) as "place where one road diverges from another" is from 1881.
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beat off (v.)
"drive (something) away by violent blows," 1640s, from beat (v.) + off (adv.). Meaning "masturbate" is recorded by 1960s.
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off-scouring (n.)

"rejected matter, that which is vile or despised," 1520s; literally "that which is scoured off;" from off (prep.) + verbal noun from scour (v.1) "cleanse by hard rubbing."

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off-rhyme (n.)

"partial or near rhyme," 1938, from off (prep.) + rhyme (n.).

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send-off (n.)

"a farewell" (especially a funeral), 1872 ("Mark Twain"), from the verbal phrase send off "cause to be sent" (attested by 1660s), from send (v.) + off (adv.). Earlier a send-off was "a start," as on a journey or race (1841), hence "a display of good-will on the occasion of such."

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