gatepost

From gate +‎ post.

gatepost (plural gateposts)

1. a vertical post from which a gate is hung/attached.
   • 1906, Rudyard Kipling, Puck of Pook's Hill, London: Penguin Books, published 1994, page 9:

     A cuckoo sat on a gate-post singing his broken June tune[.]

• pottages