Etymology
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amerce (v.)

"punishment by arbitrary or discretionary fine," 1215, earlier amercy, Anglo-French amercier "to fine," from merci "mercy, grace" (see mercy). The legal phrase estre a merci "to be at the mercy of" (a tribunal, etc.) was corrupted to estre amercié in an example of how an adverbial phrase in legalese can become a verb (compare abandon).

Frans hom ne seit amerciez pour petit forfet. [Magna Charta]

Related: Amercement; amerciable/amerceable.

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Definitions of amerce

amerce (v.)
punish with an arbitrary penalty;
amerce (v.)
punish by a fine imposed arbitrarily by the discretion of the court;
From wordnet.princeton.edu