quirks >> /kwəːk/
Definition: [verb] (with reference to a person's mouth or eyebrow) move or twist suddenly, especially to express surprise or amusement.
Example: his lips quirked disbelievingly
Definition: [noun] A peculiar aspect of a person's character or behaviour.
Example: they accepted her attitude as one of her little quirks
Definition: [noun] An acute hollow between convex or other mouldings.