bypass (n.)

also by-pass, 1848, "small pipe passing around a valve in a gasworks" (for a pilot light, etc.), from the verbal phrase; see by + pass (v.). First used 1922 for "road for the relief of congestion;" figurative sense is from 1928. The heart operation was first so called 1957.

bypass (v.)

1823, "to pass by" (implied in bypassed), from the verbal phrase; see by + pass (v.). From 1928 as "to go round, avoid;" figurative use from 1941. Related: Bypassed; bypassing.

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