Definition of have had a drop too much in English:

have had a drop too much

phrase

informal
  • Be drunk.

    ‘obstreperous squaddies who have had a drop too much’
    • ‘The wine was so good that one of my erstwhile diners had a drop too much and was sick at the table.’
    • ‘When he was brought up for having had a drop too much, the Colonel remarked to him: ‘My good man, I only wish I could drink as much as you do and keep as good a nerve. Tell me how you manage it and I will let you off.’’
    • ‘I must have had a drop too much.’