without fail

idiomatic

(idiomatic) Certainly; by all means; as a matter of importance

Japanese Meaning

必ず / 確実に / 間違いなく / 抜かりなく

She calls her mother every Sunday without fail to catch up on the week's news.

彼女は毎週日曜日、必ず母に電話してその週の出来事について近況を報告する。

Sense（1）

(idiomatic) Certainly; by all means; as a matter of importance

You will report to the police every week without fail.