窮
キュウ, キョウ, きわ.める, きわ.まる, きわ.まり, きわ.み
hard up, destitute, suffer, perplexed, cornered
JLPT1 G7 S15 F1756
As per 躬# (bend) + 穴 hole → bend in negotiating a tunnel → *be blocked/stuffed*; *be at/come to an extreme*; *end*; *dead end* (← reach the end of a tunnel). Also the borrowed meanings *investigation* and *follow through* (compare 究, 奧, and 探).
[Full Kanji Etymology List]