in the line of duty

idiom

Definition of in the line of duty

: while doing one's job a soldier/policeman/fireman who was killed in the line of duty

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“In the line of duty.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/in%20the%20line%20of%20duty. Accessed 25 Nov. 2020.

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