What is the meaning of 後手?

room for manoeuvre

defensive position

Not having the initiative; moving last in an area; responding to the opponent's threats.

A move that causes one to lose the initiative.

A position where one or both players have such a move.

The second player.

the rear part or direction of something; the back side; also, a person's appearance from behind

placing or clasping hands behind one's back

a historical way of ritual hand-clapping ((かしわ)() (kashiwade)) performed with hands behind the back or while facing backward

hanja form of 후수

Source: wiktionary.org