Definition of the joke is on someone in English:

the joke is on someone

informal Someone looks foolish, especially after trying to make someone else look so.
More example sentences
  • Or would you start to suspect that the joke is on you?
  • Everyone laughs, though we're unsure if the joke is on us.
  • But the joke is on you because I have backup right up stairs.
See parent entry: joke

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Word of the day humoresque
Pronunciation: ˌ(h)yo͞oməˈresk
noun
a short, lively piece of music