What is the meaning of Quirk?

An idiosyncrasy; a slight glitch, mannerism; something unusual about the manner or style of something or someone.

An acute angle dividing a molding; a groove that runs lengthwise between the upper part of a moulding and a soffit.

A quibble, evasion, or subterfuge.

To (cause to) move with a wry jerk.

To furnish with a quirk or channel.

To alter in a unique and unusual way.

To use verbal tricks or quibbles.

Alternative form of querk

Source: wiktionary.org