滞 means “stagnate, stay, be overdue”

たい · tai

Also: be delayed, overdue, arrears

Kun'yomi (Japanese reading)
とどこおる
On'yomi (Chinese reading)
タイ, テイ

JLPT N1 · Taught in secondary school · 13 strokes

The story

Water (氵) held back by a belt (帯): it pools and stops moving. 渋滞 is the traffic jam on every holiday expressway, 滞在 is a stay at a hotel or in a country, and when payments 滞る they fall behind.

Used in 渋滞 (juutai, traffic jam), 滞在 (taizai, stay), and 停滞 (teitai, stagnation)

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