One of the mysteries of the English language finally explained.
That cannot be revoked, rescinded, gone back on, undone, or unsaid; irrevocable.
That cannot be drawn back, in, up, etc.
Early 17th century; earliest use found in George Carleton (?1558–1628), bishop of Chichester. From un- + retract + -able<br>late 19th century; earliest use found in Samuel David Gross (1805–1884). From un- + retractable.
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