הַקְהֵה אֶת שִׁינָּיו

ביטוי (אנגלית)

To refute someone's arguments/ make his teeth blunt

הגדרה (אנגלית)

By metaphor: to reply with a decisive answer such that there is nothing left to reply (blunting means making something dull, not sharp. Dull also implies causing an unpleasant feeling of bitterness).

("In those days they will no longer say, 'The fathers ate a good harvest, and the sons will be weary' - Jeremiah is powerless, and so: "What does this wicked man say? What is this work to you....And you will gnash his teeth and say to him: 'This is what the Lord did to me when I came out of Egypt'" - The Passover Haggadah)