with respect or regard to: Let's play a joke on him. Write a critical essay on Shakespeare.
:in a state or condition of; in the process of: on strike; The house is on fire!
:subject to: a doctor on call.
: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.副词 adverb
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.形容词 adjective
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.