先 means “ahead”

さき · saki

Also: before, previous, future

Kun'yomi (Japanese reading)
さき, まず
On'yomi (Chinese reading)
セン

JLPT N5 · Taught in grade 1 · 6 strokes

The story

A person walking forward, feet stepping beyond the present, always moving toward what comes next.

Means "before" or "tip"; used in 先生 (sensei, teacher, literally "born before")

Words with 先

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