Definition
to refrain from consuming or utilizing something harmful, or to prevent someone else from doing so
（使某人）避免食用、飲用或使用
To maintain my health, the doctor advised me to keep off fast food.
為了維持健康，醫生建議我避免食用快餐。
She worked hard to keep her children off sugary foods.
她努力讓她的孩子們遠離含糖食品。
If you want to improve your athletic performance, it's best to keep off alcohol.
如果你想提升運動表現，最好遠離酒精。