n. A highway or section of a highway that passes around an obstructed or congested area.n. A pipe or channel used to conduct gas or liquid around another pipe or a fixture.n. A means of circumvention.n. Electricity See shunt.n. Medicine An alternative passage created surgically to divert the flow of blood or other bodily fluid or circumvent an obstructed or diseased organ.n. Medicine A surgical procedure to create such a channel: a coronary artery bypass; a gastric bypass. v. To avoid (an obstacle) by using an alternative channel, passage, or route.v. To be heedless of; ignore: bypassed standard office procedures. v. To channel (piped liquid, for example) through a bypass.