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duty bound

Obliged, as in You're duty bound to help your little brother. [c. 1900]

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.

Related Words for duty bound

appreciative, obliged, thankful, beholden, grateful, obligated, duty-bound, indebted, compelled, enslaved, guilty, answerable, important, liable, culpable, subject, constrained, restrained, forced, indentured