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Bottle up
 means to hide or suppress them instead of expressing them openly. It often refers to keeping strong emotions—like anger, sadness, or frustration—to yourself rather than addressing them.

Examples:
1- After losing his job, Mark tried to bottle up his worries so he wouldn’t worry his wife. Eventually, the pressure got too high, and he broke down in tears one evening.
2- Some psychologists warn that people who bottle up their emotions for too long risk facing sudden emotional breakdowns or even physical symptoms.