on the dry

on the dry

informal Not partaking of alcoholic beverages; sober. Sure, I'll go to the bar with you, but just to keep you company—I'm on the dry right now. No beer for me, thanks. I have to be up early, so I'm staying on the dry.
See also: dry, on
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.