孤 means “solitary, orphaned”

こ · ko

Also: orphan, alone

On'yomi (Chinese reading)
コ

JLPT N1 · Taught in secondary school · 9 strokes

The story

A child (子) beside a melon (瓜) left hanging alone on the vine: picture an orphan. 孤 is alone in the world: 孤児 is an orphan, 孤立 isolation, and 孤独のグルメ is the TV series about a man who always eats alone.

Used in 孤独 (kodoku, loneliness/solitude), 孤立 (koritsu, isolation), and 孤児 (koji, orphan)

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