陥 means “fall into, cave in”

おちいる · ochiiru

Also: collapse, fall (castle)

Kun'yomi (Japanese reading)
おちいる, おとしいれる
On'yomi (Chinese reading)
カン

JLPT N1 · Taught in secondary school · 10 strokes

The story

A hill (阝) and a person (ク) dropping into a pit, the 旧 shape that was once 臼: falling into a trap. 陥る is to fall into, a crisis or a slump, 欠陥 is a defect, and 陥落 is the fall of a castle or city.

Used in 陥る (ochiiru, to fall into), 欠陥 (kekkan, defect), and 陥落 (kanraku, fall/surrender)

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Readings from KANJIDIC2, © EDRDG, CC BY-SA.