Also means
undertow
Usage Note
Resaca has two distinct meanings: the undertow or backwash of a wave (its original nautical sense), and a hangover after drinking too much alcohol. In everyday speech the hangover sense dominates. Tengo resaca is the standard way to say 'I have a hangover' — Spanish does not use estar with resaca.
Examples
"Tengo una resaca terrible esta mañana."
Natural Translation
I have a terrible hangover this morning.
Related Words
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