How to say "to worry, to trouble" in Russian?

Волновать

"to worry, to trouble" is Волновать in Russian.

Волновать means "to worry, to trouble" in English.

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Word #1978 of 4,000 by frequency in Russian — level B1.

Example

Меня начинает волновать её долгое молчание.

Her long silence is starting to worry me.