Be taking medication or an illegal drug, as in Are you on some antibiotic? or He was definitely on narcotics when it happened. [1930s]
Be in favor of something or willing to participate, as in We're going dancing after the play—are you on? [Colloquial; late 1800s]
Be engaged in some action, especially on the stage, as in Hurry up, you're on in five minutes. [Late 1700s]
Perform extremely well, as in I can't return Dan's serve—he's really on today. [Slang; second half of 1900s]
Be scheduled, as in Is tonight's rally still on? [Colloquial; second half of 1990s]
be on one. Be at one's expense, either as a treat or the butt of a joke. For example, This round of drinks is on me, or He enjoys a good laugh, even when the joke's on him. [Colloquial; second half of 1800s]
not be on. Be unacceptable, not allowable, as in I can't believe you'd cancel; that's just not on. This usage is more common in Britain than America. [Colloquial; 1930s] For a synonym, see not done. Also see be on to.
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Words nearby be on
Idioms and Phrases with be on (2 of 2)
see be on.
Example sentences from the Web for be on
Just the hard-on before you shoot unarmed members of the public.'Babylon' Review: The Dumb Lives of Trigger-Happy Cops|Melissa Leon|January 9, 2015|DAILY BEAST
Three on-the-record stories from a family: a mother and her daughters who came from Phoenix.I Tried to Warn You About Sleazy Billionaire Jeffrey Epstein in 2003|Vicky Ward|January 7, 2015|DAILY BEAST
You just travel light with carry-on luggage, go to cities that you love, and get to hang out with all your friends.
It was a brick wall that we turned into the on-ramp of a highway.
Could the (thus far) timid trembling give way to a full-on, grand mal seizure?26 Earthquakes Later, Fracking’s Smoking Gun Is in Texas|James Joiner|January 7, 2015|DAILY BEAST
"Buy something for your wife that-is-to-be," he said to his grand-nephew, as he handed him the folded paper.The Pit Town Coronet, Volume I (of 3)|Charles James Wills
Everything showed a rapid flight; even the would-be dinner of the guerrillas was found half cooked.The Courier of the Ozarks|Byron A. Dunn
I drew back from the rim of Writing-On-the-Stone, that set of whispered phrases echoing in my ears.Raw Gold|Bertrand W. Sinclair
Next night at dinner I proposed Sir Alister's health, and we all drank to him and his "bride-to-be."
While a one-step was in full swing some would-be wag suddenly turned off all the lights.