just deserts

• (UK) IPA^(key): /dʒʌst dɪˈzɜː(ɹ)ts/

• Audio (AU)

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just deserts pl (plural only)

1. (idiomatic) A punishment or reward that is considered to be what the recipient deserved.

   It may appear that they're getting ahead by cheating, but they'll get their just deserts in the end.

• Deserts here is the plural of desert, meaning "that which one deserves". "Desert" is now archaic and rarely used outside this phrase.
• The spelling just desserts is non-standard. It is sometimes used as a pun in, for example, restaurant names.

• payback, poetic justice, comeuppance

• have it coming
• serve someone right

• Oxford University Press article