by chance

Definitions

Without a deliberate plan or intention; accidentally.

Occurring as a result of luck or random circumstances.

Examples

I met an old friend by chance while I was walking through the park.

We found the hidden treasure by chance when we were exploring the cave.

It was only by chance that I noticed the mistake before submitting the report.

Synonyms

accidentally coincidentally fortuitously randomly unintentionally unexpectedly serendipitously

Antonyms

deliberately intentionally purposely designedly planned calculated methodically