慣 means “get used to, habit”

なれる · nareru

Also: accustomed, become experienced

Kun'yomi (Japanese reading)
なれる, ならす
On'yomi (Chinese reading)
カン

JLPT N3 · Taught in grade 5 · 14 strokes

The story

A heart (忄) with a thread run straight through it (貫): do something every day and it strings itself into you. 慣れる is to get used to, and 習慣 is a habit or custom, like slipping your shoes off at the door.

Used in 慣れる (nareru, to get used to), 習慣 (shuukan, habit/custom), and 慣用句 (kan'youku, idiom)

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