守 means “protect, keep”

まもる · mamoru

Also: guard, defend, obey

Kun'yomi (Japanese reading)
まもる, まもり, もり, かみ
On'yomi (Chinese reading)
シュ, ス

JLPT N3 · Taught in grade 3 · 6 strokes

The story

A hand (寸) under a roof (宀): someone keeping watch over the house. 守る is to protect or to keep a promise, an お守り from a shrine keeps its owner safe, and 留守 means nobody is home.

Used in 守る (mamoru, to protect/keep), お守り (omamori, protective charm), and 留守 (rusu, being away from home)

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