膽
タン, きも
gall bladder, bravery, courage
JLPT0 G13 S0 F5000
As per 詹# (bear a burden) + 肉 flesh → gallstones burdening a *gallbladder* → *courage* (← courage welling from deep within; compare English "guts") → *pluck*; *nerve*. Compare 肝 and 腹.
[Full Kanji Etymology List]