遭 means “meet with (trouble)”

あう · au

Also: encounter, meet, party, association

Kun'yomi (Japanese reading)
あう, あわせる
On'yomi (Chinese reading)
ソウ

JLPT N1 · Taught in secondary school · 14 strokes

The story

Walking (辶) straight into 曹, an officer, as in 軍曹, sergeant: picture an unlucky run-in on the road. 遭う is meeting with trouble, as in 事故に遭う, 遭難 is being lost at sea or in the mountains, and 遭遇 is an encounter, like a bear on a trail.

Used in 遭う (au, to meet with), 遭難 (sounan, being lost/in distress), and 遭遇 (souguu, encounter)

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