one too many

From one drink (of an alcoholic beverage) too many.

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one too many

1. Used other than figuratively or idiomatically: see one,‎ too many.

   We’ve got three too many.

   Even if one child is hurt that is one too many.

2. (idiomatic) One or more servings too many of alcohol, leading to drunkenness.

   He's had one too many.

• “one-too-many”, in Cambridge English Dictionary, Cambridge, Cambridgeshire: Cambridge University Press, 1999–present.
• “have one too many”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022.