n (rfc-sense) That part of an object furthest away in the opposite direction from that in which an unsupported object would fall.
n The part viewed, or intended to be viewed, nearest the edge of the visual field normally occupied by the uppermost visible objects.
n (baseball) The first half of an inning, during which the home team fields and the visiting team bats.
n (LGBT|slang) A gay man who likes take an active sexual role rather than a passive role (e.g. to penetrate in anal sex rather than be penetrated).