set off
To leave; to set out; to begin a journey or trip.
To begin; to cause; to initiate.
To put into an angry mood; to start (a person) ranting or sulking, etc.
To enhance by emphasizing differences.
To offset, to compensate for: to reduce the effect of, by having a contrary effect.
(historical) To deface or soil the next sheet; said of the ink on a freshly printed sheet, when another sheet comes in contact with it before it has had time to dry.