Answer: SWEAR

AnswerCrossword Clue
SWEARMake a vow
SWEARCuss a blue streak
SWEARUse profane language
SWEARAttest
SWEARGive a damn?
SWEARVow to honor an oath
SWEARSolemnly promise
SWEARUtter a promise ... or a profanity
SWEARExchange vows
SWEARCross one's heart
SWEARKeep the censor busy
SWEARDeclare solemnly
SWEARMake an oath
SWEARState under oath
SWEARState an oath, one way or another
SWEARVow under oath
SWEARGive testimony
SWEARGive an oath
SWEARShow that you're leveling
SWEARUse profanity
swearto bind oneself by an oath; vow
SWEARSpeak French, you might say
SWEARTake an oath
SWEARAffirm
SWEARSpeak indelicately
SWEARTalk a blue streak?
SWEARUse cusswords
SWEARTake a vow
SWEARCuss
SWEARUtter oaths
SWEARSpeak an oath
SWEARUse four-letter words
SWEARRisk an FCC fine, perhaps
SWEARVow
SWEARTestify
SWEARGive one's word
SWEARPromise
SWEARCurse
SWEARIncense the censor
SWEARSpeak bluish?