three sheets to the wind
a trifle above par
a trifle disguised
dipping rather deep
in his cups
shot in the neck
(Most of those are gleaned from Georgette Heyer’s books, by the way – she wrote historical romances with beautifully-researched accurate settings and authentic slang. Well worth a read or five.)
It almost makes me want to drink sometimes just to have a chance to use them.
What idiom do you wish you could use more often?