pillow / to pillow / to rest one's head on (Taiwan pr. [zhen4] for this sense)
枕
=
冘
+
木
:
James II of England (zh) got a new treadmill (冘) for Christmas and he set it up right in front of the Christmas tree (木) in the encampment's living room ((e)n3). When he falls off the treadmill for the first time he falls right into the Christmas tree, which is quite painful and teaches him a lesson. From now on, he'll strap a pillow (枕) to his back.