What's the "een" in Halloween?
1823, "to pass by" (implied in bypassed), from bypass (n.). From 1928 as "to go around, avoid;" figurative use from 1941. Related: Bypassed; bypassing.
bypass by·pass (bī'pās')
A passage created surgically to divert the flow of blood or other bodily fluid or to circumvent an obstructed or diseased organ.
A surgical procedure to create such a channel.