When you use the phrase ‘Bite Your Tongue’ you mean to keep quiet, particularly in
the event someone is saying something rude or unpleasant.
Example of use: “I know you want to yell at him, but you’ll just have to bite your tongue.”
A phrase similar to ‘bite your tongue’ is first seen in Shakespeare’s 1593 Henry VI, I: “So Orke must sit, and fret, and bit his tongue.”