not a bit of it Definition

bit¹
noun

1. A small piece, part or amount of something.

Thesaurus: fragment, crumb, particle, jot, mite, trifle, scintilla, modicum, speck, pinch, moiety; Antonym: excess, lot.
(Brit)
2. old use
A coin, especially a small coin.
Example: threepenny bit
(N Amer)
3. 12½ cents (ie a quarter, a half, and three-quarters of a dollar, respectively). See also two-bit.

Form: two-bits (only)
Form: four bits
Form: six bits

Idiom: a bit

A short time or distance.
Example: Wait a bit

A little; slightly; rather.
Example: feel a bit of a fool

A lot.
Example: takes a bit of doing

Idiom: a bit much (a bit thick, a bit rich)

colloq
Behaviour that is unacceptable, unreasonable or unfair.

Idiom: a bit of all right

colloq
Someone or something very much approved of.

Idiom: a bit of rough

See under rough.

Idiom: a bit off

(rit)
colloq
Bad manners, taste or behaviour.

Derivative: bit on the side

See separate entry.

Idiom: bit by bit

Gradually; piecemeal.
Thesaurus: gradually, piecemeal, step by step, insidiously; Antonym: wholesale.

Idiom: do one's bit

colloq
To do one's fair share.

Idiom: not a bit (not a bit of it)

Not at all; not to any extent.

Etymology: Anglo-Saxon bita in obsolete sense ‘a portion of something bitten off at one time'; see bite.