STOP yourself from saying something because it would be BETTER not to.' Let's understand the MEANING of the given idiom:Bite your TONGUE means to MAKE a desperate effort to avoid saying something. (Bite your tongue का मतलब है कुछ कहने से बचने के लिए बेताब प्रयास करना।)Example: When he was sneering at his assistants and praising himself, I had to bite my tongue from making a retort.From the meaning and example, we can say the correct answer is 'to stop yourself from saying something because it would be better not to.'Thus option 1 is the most appropriate answer