on the wagon INFORMAL
If you are on the wagon, you have decided not to drink any alcohol for a period of time:
He was on the wagon for ten years, when he was living in Connecticut.

[TahlilGaran] Advanced Learner's Dictionary ▲

on the wagon
not drinking any alcohol, after a period of drinking regularly.
He's been on the wagon for ten years now.

Usage notes: usually said about someone who has an alcohol problem
Opposite of: off the wagon

[TahlilGaran] English Idioms Dictionary ▲

on the wagon
to be not drinking alcohol (usually used for someone who has a drinking problem)
He has been on the wagon for over seven months now.

[TahlilGaran] English Idioms Dictionary ▲

on the wagon
adv. phr. Participating in an alcohol addiction program; not touching any alcoholic beverage.
Jim's doctor and his family finally managed to convince him that he was an alcoholic and should go on the wagon.
Antonym: FALL OFF THE WAGON.

[TahlilGaran] English Idioms Dictionary ▲