How to say "by chance, accidentally" in Russian?

Случайно

"by chance, accidentally" is Случайно in Russian.

Случайно means "by chance, accidentally" in English.

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Word #1360 of 4,000 by frequency in Russian — level B1.

Example

Она случайно разбила любимую чашку матери.

She accidentally broke her mother's favorite cup.