尿
KanjiJLPT N1
Urine

Mnemonic

A flag marks the occupied porta-potty at the county fair. Under the door, water trickles out — but it's warm, yellow urine! The flag flutters helplessly above as the water keeps pooling wider, warning every passerby to steer clear of the growing puddle.
Additional thoughts
Visualize the flag (尸) sitting on top of water (水), just like in the kanji structure. The flag is the roof/sign of the outhouse, the water beneath is the urine escaping underneath the door.
Quick recall
A flag over a porta-potty with water trickling out — that's urine!

Details

The keyword for 尿 is urine. This kanji refers to the liquid waste product excreted by the kidneys, and it is used in both everyday and medical contexts in Japanese. It encompasses all meanings related to the bodily function of urination and the fluid itself. The character is commonly found in clinical and scientific terminology pertaining to the urinary system and its processes.
On'yomi
にょう
Kun'yomi
ゆばり、いばり、しと