›engaged in or involved with: He's on the second chapter now.
›: a duty on imported goods; She depends on her friends for encouragement.
›: on my word of honor; The movie is based on the book.
›: on pain of death.
›: We completed the project on budget.
›assigned to or occupied with; operating: Who's on the switchboard this afternoon?
›Informal. so as to disturb or affect adversely: My hair dryer broke on me.
›Informal. paid for by, especially as a treat or gift: Dinner is on me.
›taking or using as a prescribed measure, cure, or the like: The doctor had her on a low-salt diet.
›regularly taking or addicted to: He was on drugs for two years.
›Informal. with; carried by: I have no money on me.
›: on Sunday; We demand cash on delivery.
›: to march on the capital.
›: to gaze on a scene.
›: views on public matters.
›: The pickpocket crept up on a victim.
adv.adverb · 副词
1.
›in, into, or onto a position of being supported or attached: Sew the buttons on.
›in, into, or onto a position of covering or wrapping: Put your raincoat on.
›fast to a thing, as for support: Hold on!
›toward a place, point, activity, or object: to look on while others work.
›forward, onward, or along, as in any course or process: further on.
›with continuous activity: to work on.
›into or in active operation or performance: Turn the gas on.
adj.adjective · 形容词
1.
›operating or in use: The television set was on. Is your brake on?
›taking place; occurring: Don't you know there's a war on?
›performing or broadcasting: The radio announcer told us we were on.
›Informal. behaving in a theatrical, lively, or ingratiating way: Around close friends, one doesn't have to be on every minute.functioning or performing at one's best: When she's on, no other tennis player is half as good.
›scheduled or planned: Anything on after supper?
›Baseball. positioned on a base or bases: They had two men on when he hit the home run.
›Cricket. noting that side of the wicket, or of the field, on which the batsman stands.