いざという時

いざというとき

at the critical moment; when the time comes; when it's most important; when necessary

Also written いざと言う時

Meaning

expnadv
at the critical moment; when the time comes; when it's most important; when necessary; in an emergency; when push comes to shove

Example sentences

彼はいざという時に君を見捨てるような人ではない。

He is the last person to leave you in time of need.
いざという時役に立つよ。

This will come in handy in a pinch.
いざという時に風が吹かなくなった。

The wind failed us.