Student or Learner
Hello, I am not sure if that idiom means also to drink the content of the glasses all in one go or just to lift the glasses when drinking a toast. And if it does not is there any idiom used to drink the content all in one go? Thanks.
Bottoms up does mean to drink. The bottom of the glass will be up in the air so the liquid flows down -- but to be honest, I don't believe it means to drink it all down in one giant gulp. You can "chug" the contents of a bottle or glass all at once.
To just raise your glass to someone, you can say "Cheers."
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.