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tr.v. a·merced, a·merc·ing, a·merc·es Law
To punish by fine or other penalty.
[Middle English amercen, from Anglo-Norman amercier, from à merci, at the mercy of : à, to (from Latin ad; see ad-) + merci, mercy (from Latin mercēs, wages).]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.