in (one's) cups
Drunk. When you're in your cups, foolish ideas have a peculiar tendency of sounding like excellent ones. He called to apologize the following morning, claiming that he had been in his cups when he made those rude remarks.
in one's cups
Euph. drunk. She doesn't make much sense when she's in her cups. The speaker—who was in his cups—could hardly be understood.
in (one's) cups
Intoxicated; drunk.