緩 means “loose, slack, gentle”

ゆるい · yurui

Also: slacken, loosen, relax, lessen

Kun'yomi (Japanese reading)
ゆるい, ゆるやか, ゆるむ, ゆるめる
On'yomi (Chinese reading)
カン

JLPT N1 · Taught in secondary school · 15 strokes

The story

Thread (糸) beside 爰, a hand (爫) reaching down to a hand (又), as in 援: picture fingers easing a knot loose. 緩い is loose or lax, a 緩やかな坂 is a gentle slope, and 規制緩和 is deregulation.

Used in 緩い (yurui, loose/lax), 緩やか (yuruyaka, gentle/gradual), and 緩和 (kanwa, easing/relief)

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