Unfasten

Origin

- + fasten

Full definition of unfasten

Verb

1. (transitive) To loose; to unfix; to unbind; to untie; figuratively, to detach from any connecting link or agency; to disconnect.
2. (intransitive) To come untied or unloosed.

Synonyms

• undo
• unbutton
• untie
• unzip

Antonyms

• do up
• button
• button up
• tie up
• zip
• zip up