bypass (n.) Look up bypass at Dictionary.com
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.) Look up bypass at Dictionary.com
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.