焦 means “fret, scorch, focus”

あせる · aseru

Also: char, hurry, impatient, irritate

Kun'yomi (Japanese reading)
こげる, こがす, こがれる, あせる, じれる
On'yomi (Chinese reading)
ショウ

JLPT N1 · Taught in secondary school · 12 strokes

The story

A bird (隹) over fire (灬): picture a sparrow roasting until its feathers char. 焦げる is to scorch, like forgotten toast, 焦る is the heat of panic when time runs short, and 焦点, a lens's burning point, is a focus.

Used in 焦る (aseru, to fret/be in a rush), 焦げる (kogeru, to scorch), and 焦点 (shouten, focus)

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