not to worry

Phrase

There is no need for concern; there isn't a serious problem.

Japanese Meaning

心配する必要がない / 気にする必要がない / 大丈夫、問題ない

She told him not to worry about the exam because he had prepared well.

彼女は彼に、よく準備していたので試験のことは心配する必要はないと言った。

Sense（1）

There is no need for concern; there isn't a serious problem.

She didn't catch this train, but not to worry: she can get the next one.