Examples:

• Bite your lip and don't say anything to your brother.
• I just had to bite my lip while the boss yelled at me for losing the account.
• She bit her lip as she recalled the words he'd thrown at her.
• If someone tries to provoke you, just bite your lip and keep walking.
• You could tell she thought the criticism was unfair but she bit her lip and said nothing.
• she bit her lip to stop the rush of bitter words.
• Don't bite your lip.