What's solemnly sworn (4)

I believe the answer is:

oath

(Other definitions for oath that I've seen before include "It could be ruddy when minced" , "Vow; profanity" , "It's taken in court" , "Solemn promise to tell the truth or be loyal" , "Vow, sworn word" .)

I've seen this clue in the Newsday.

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