(idiomatic) (It's of) minor importance, at least not as important as it first seemed.

The rear, back, or unseen portion (of something). / (computing) That part of a hardware or software system that is farthest from the user; the internals rather than the user interface.

A final product, especially one resulting from a series of stages or processes.

The back or hindmost part of anything, such as a car. / (slang) The buttocks.

The unsmoked end of a cigarette or cigar.

Any attachment on the end of a robot that interacts with the environment, such as a device to lift parts. / The terminal moving part of a limb that interacts with the environment.

(curling) Overtime in a tied game

(curling) An end in which no stones are touching the house, and thus no points are scored.

(snooker) The end of a snooker table where the green, brown and yellow balls are initially placed

(colloquial) That is as much as I know, am prepared to reveal or am willing to say about the subject. / (colloquial) That is the definitive fact; there can be no argument.