swear to (?.)

• OK
• accept
• accredit
• affirm
• amen
• and candle
• approve
• assert under oath
• assure
• attest
• authenticate
• authorize
• autograph
• book
• certify
• confirm
• cosign
• countersign
• depone
• depose
• endorse
• give permission
• give the go-ahead
• give the imprimatur
• give thumbs up
• guarantee
• initial
• kiss the book
• notarize
• pass
• pass on
• pass upon
• permit
• ratify
• rubber stamp
• sanction
• say amen to
• seal
• second
• sign
• sign and seal
• subscribe to
• support
• swear
• swear and affirm
• swear by bell
• swear the truth
• swear to God
• swear to goodness
• testify
• undersign
• underwrite
• validate
• visa
• vise
• vouch
• vow
• warrant