A1 [ C ] a square or rectangular container with stiff sides and sometimes a lid:

A1 [ C ] a box and its contents, or just the contents of a box:

[ C ] UK US cup a piece of hard plastic worn by men to protect their sex organs when playing a sport

A2 [ C ] any square or rectangular space on a form, sports field, road, etc., separated from the main area by lines:

[ C usually singular ] →  penalty area

[ C ] US UK box junction a place where two roads cross, marked with a square of yellow lines painted in the centre, that you can drive over only when the road in front is clear

[ C ] a small space with walls:

[ C ] a small area with seats that is separate from the other seats in a theatre or at the side of a sports field:

[ C ] also PO box a box with a number in a post office to which your letters can be sent and from which you can collect them

[ U ] a small evergreen tree (= one that never loses its leaves) with small, shiny leaves

[ I or T ] to fight someone in the sport of boxing:

[ T ] also box up to put something in a box: