off the cuff Definition

cuff¹
noun

1. A band or folded-back part at the lower end of a sleeve, usually at the wrist.
(N Amer)
2. The turned-up part of a trouser leg.
3. slang
Handcuffs.
Form: cuffs

Idiom: off the cuff

colloq
Without preparation or previous thought.
Thesaurus: extemporaneously, impromptu, ad hoc, on the spur of the moment, spontaneously, impulsively, offhand, unrehearsed.

Etymology: 15c in sense 1; 14c meaning ‘mitten', now obsolete except in Canadian dialect.

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off the cuff cuff¹