in (also at) the rearward: in the rear. Now rare.

With prepositions. at the back of: behind, close behind; with the pregnant senses of supporting, following, pursuing, chasing; cf. 5 at the back of…

in the rear (less frequently in rear): in the hindmost part (of an army, etc.); (hence) at or from the back, behind.

in the rear (less frequently in rear): in the hindmost part (of an army, etc.); (hence) at or from the back, behind.

in (also at, on) one's rear: at one's back, behind one.

In the hinder place or position: see rear, n.2

in retard: in a delayed state, late; (also) belatedly.

Also in back, in or at the back (North American colloquial); cf. in front at front, n. 10b.