Definition of mustard pot in English:

mustard pot

Pronunciation /ˈmʌstəd pɒt/

noun

  • A pot or cruet for holding table mustard.

    In Wyclif's sarcastic phrase, often echoed by Protestant controversialists in the 16–17th centuries, the word seems to mean: a jar for keeping a supply of ready-mixed mustard, covered with parchment to exclude the air.

Origin

Late Middle English; earliest use found in John Wyclif (d. 1384), theologian, philosopher, and religious reformer. From mustard + pot.