to trap / to surround / hard-pressed / stranded / destitute
困
=
囗
+
木
:
Mnemonic symbol: a sleeping bag.
Karl Koala has been putting Christmas trees into boxes all day, and now he is very tired. He climbs one of the Christmas trees he already put into a box, slips into his sleeping bag and falls asleep on the tree.
困
=
囗
+
木
:
New mnemonic symbol to avoid confusion with 夗: sleeping pills.