Meaning: いざとなったら、ここぞという時
For Example:
‣ She is not perfect and often makes mistakes, but when push comes to shove, she can do very well.
彼女は完璧やないしミスもよぉするけど、いざという時はよぉやるんよ。
‣ He never wants to rely on anyone, but when push comes to shove, he will ask for help.
彼は基本的に誰にも頼らんけど、ほんまに助けが必要になった時は、ちゃんと頼っとる。
Synonym:
critical moment
ultimately