intercalary / an extra day or month inserted into the lunar or solar calendar (such as February 29)
闰
=
王
+
门
:
Normally it is forbidden to hunt rhinoceroses in the encampment ((e)n4), but today is an intercalary day (闰) at which it is allowed. Martin Luther King (王) found Rachel Rhinoceros (ru) trapped in the bathroom ((e)n4), but as he approaches her with a vicious laugh, he doesn't notice that he's standing on a trap door (门) which he is about to fall through.