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Common words appear frequently in written and spoken language across many genres from radio to academic journals.
Informal words should be reserved for casual, colloquial communication.
verb unfasten

Synonyms for unbutton

verb unfasten

Antonyms for unbutton

Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.
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These Words Are Acronyms