[nʌb], (Noun)

Definitions:
- the crux or central point of a matter
(e.g: the nub of the problem lies elsewhere)

- a small lump or protuberance
(e.g: he pressed down on the two nubs on top of the phone)


Phrases:

Origin:
late 16th century (denoting the innermost wrapping of the chrysalis in a silk cocoon): apparently a variant of dialect knub ‘protuberance’, itself either a variant of knob, or from Middle Low German knubbe (German Knubbe) ‘knob’