Etymology
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arm-rest (n.)

also armrest, "something designed as a rest for the arm," by 1850, from arm (n.1) + rest (n.).

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side-swipe (v.)
also sideswipe, "to strike with a glancing blow," 1904, from side (adj.) + swipe (v.). Related: Side-swiped; side-swiping. The noun is first recorded 1917.
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side effect (n.)
also side-effect, 1884, from side (adj.) + effect (n.). Medical use, with reference to drugs, is recorded from 1939.
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blind side (n.)
"weak or unguarded aspect of a person or thing," c. 1600; see blind (adj.). As a verb, also blindside, "to hit from the blind side," first attested 1968, American English, in reference to U.S. football tackles.
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side-saddle (n.)
"saddle made for the occupant to ride on with both feet on the same side of the horse," used chiefly by women, late 15c., from side (adj.) + saddle (n.).
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side-way (n.)
also sideway, 1550s, lateral space for passage or movement," from side (n.) + way (n.).
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sidearm (adj.)
also side-arm, 1908, from side (adj.) + arm (n.1).
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sidearms (n.)
also side-arms, 1760, from side (adj.) + plural of arm (n.2).
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