いざという時役に立つ。

いざという時役に立つ。

This will come in handy in a pinch.

いざという時(とき)役(やく)に立(た)つ。

Iza toiu toki yakunitatsu.

いざ (いざ)

now; come (now); well

と言う (という、とゆう)

called; named; as many as; as much as; all X; every X

時 (とき)

time; hour; moment; occasion; case; chance; opportunity; season; the times; the age; the day; tense

役に立つ (やくにたつ)

to be helpful; to be useful

Readings: ジ、とき、 -どき

Meanings: time, hour

Readings: ヤク、エキ

Meanings: duty, war, campaign, drafted labor, office, service, role

Readings: リツ、リュウ、リットル、た.つ、 -た.つ、た.ち-、た.てる、 -た.てる、た.て-、たて-、 -た.て、 -だ.て、 -だ.てる

Meanings: stand up, rise, set up, erect