Mum-in-law

noun, slang

noun, slang ·Uncommon ·College level

Definitions

Noun
  1. 1
    mother-in-law informal

Synonyms

All synonyms
mother-in-law

Etymology

From mum + -in-law.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.