Learn useful ways to say "is my job" in English with drama examples and natural alternatives.

This means the speaker is firmly refusing to change his decision because he sees it as his duty.
From The Unforgettable Love, Episode 49
A father states that protecting his daughter is his responsibility and he will not change his mind.
Use this in serious family or authority situations when you need to close discussion. It can sound controlling or inflexible if used casually.
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