set off
verb
Meaning
To leave; to begin a journey or trip.
"He set off in search of better opportunities."
To begin; to cause; to initiate.
"I had no idea that one simple comment would set off such a huge argument."
To cause to explode, let off.
"What a tragedy, that someone would set off a bomb in a crowded place."
To make angry.
"Don't set him off or he won't shut up all day."
To enhance by emphasizing differences.
"Her plain white dress was set off by a bright red stole."
To offset, to compensate for: to reduce the effect of, by having a contrary effect.
"My taxes did not increase because the amount of my raise was set off by my losses in the stock market."
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.