wag ‧ on BrE AmE ( also waggon British English ) /ˈwæɡən/ noun [countable]
[ Date: 1400-1500 ; Language: Dutch ; Origin: wagen ]
1 . a strong vehicle with four wheels, used for carrying heavy loads and usually pulled by horses ⇨ cart
2 . British English a large open container pulled by a train, used for carrying goods SYN freight car American English
3 . be/go on the wagon informal to not drink alcohol any more
4 . fall off the wagon informal to start drinking alcohol again after you have stopped
⇨ ↑ paddy wagon