偃
エン, ふ.せる
dam, weir
JLPT0 G13 S0 F5000
As per
匽
# (set in place) +
人
person → *lay (the body) down/low*; *lay (a weapon/tool) down* and take a rest. *Weir* is a borrowed meaning, via
堰
.
[Full Kanji Etymology List]