"%&[email protected]," in comics (4)

I believe the answer is:

oath

(Other definitions for oath that I've seen before include "A curse - or a pledge" , "'Profane, or solemn expression (4)'" , "Profane or obscene expression" , "Courtroom promise" , "Vow, sworn word" .)

I've seen this clue in The New York Times.

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