A2
at or near the back of something
Dictionary examples:
The teacher's secret candy stash was in the back drawer. (0.0)
I keep my emergency chocolate in the back pocket of my bag. (0.0)
The back seat of the clown car was surprisingly roomy. (0.0)
I put it in the back pocket of my jeans. (28.2)
a back door/room (31.9)
the back page/seat (33.6)