tie a knot with one's tongue not to be undone with one's teeth

уст., диал.

(tie a knot with one's (или the) tongue not to be undone (или untied) with one's (или the) teeth)

связать себя узами брака

Ld. Sparkish: "...Is your friend Ned Kattle marry'd?" Neverout: "Yes, faith, my Lord; he has tied a knot with his tongue, that he can never untie with his teeth." (J. Swift, ‘Swift's Polite Conversation’, ‘Dialogue I’) — Лорд Спаркиш: "...ваш друг Нед Кэттл женат?" Невераут: "Да, конечно, милорд. Он успел связать себя узами брака."