shutting post n 1: the gatepost against which the gate closes
Gatepost \Gate"post`\ (g[=a]t"p[=o]st`), n. 1. A post to which a gate is hung; -- called also {swinging post} or {hinging post}. [1913 Webster] 2. A post against which a gate closes; -- called also {shutting post}. [1913 Webster]