not by a long chalk Definition

chalk
noun

1. A soft fine-grained porous rock, composed of calcium carbonate, often pure white or very light in colour, and formed from the shell fragments of minute marine organisms, used in paints, putty, cement, fertilizers, etc.
2. A material similar to this, usually calcium sulphate, or a stick of it, often coloured, used for writing and drawing, especially on a blackboard.

verb

chalked, chalking
1. To write or mark in chalk.

Derivative: chalk-like
adj

Idiom: by a long chalk

colloq
By a considerable amount.

Idiom: as different as chalk and cheese (as like as chalk and cheese)

colloq
Completely different.

Idiom: not by a long chalk

colloq
Not at all.

Etymology: Anglo-Saxon cealc, from Latin calx, calcis limestone.

Phrasal Verb: chalk something up

To add an item to one's list of successes or experiences.

Phrasal Verb: chalk something up

To someone to add it to the account of money owed by or to them.