KanjiJLPT N1
Coffin

coffin, casket

Mnemonic

A grand old tree in the government courtyard is chopped down when the head bureaucrat dies. Its wood is shaped into a fine coffin — fitting, since the bureaucrat spent decades sitting beneath that tree during lunch breaks. Now the tree cradles him one last time.
Additional thoughts
Picture a massive oak in front of a gray government building. Workers saw it into planks, carefully assembling the coffin while other bureaucrats watch solemnly from their office windows. The tree that shaded his career now shelters him in death.
Quick recall
A tree is cut down to build a bureaucrat's coffin.

Details

The keyword for 棺 is coffin. This kanji refers to the wooden box or casket in which a deceased person is placed for burial or cremation. It specifically denotes the inner container that holds the body, as opposed to the outer burial case. The character conveys the solemn and funerary context of preparing the dead for their final rest.
On'yomi
かん