(idiomatic) Absolutely not; no way.

(informal) To not know; to have no idea.

(now archaic or regional) in no way; not at all

(idiomatic) Absolutely not; under no circumstances. / (idiomatic) Indicates astonished disbelief.

Something easy, not difficult, not posing problems.

certainly, sure (said when granting a request) / no thanks is necessary; you're welcome (said in response to an expression of gratitude)

(military) The ground between trenches where a soldier from either side would be easily targeted.

(informal) To be nosy; to meddle or interfere in the affairs of another.

(geology) a concretion of oxides of manganese and iron found on the floor of many oceans

plural of persona non grata