B1 Expression

boil up

To heat a liquid until it boils. Figuratively, it describes a negative emotion, like anger or anxiety, that starts to build inside someone.

To heat a liquid until it boils. Figuratively, it describes a negative emotion, like anger or anxiety, that starts to build inside someone.

To heat a liquid until it boils. Figuratively, it describes a negative emotion, like anger or anxiety, that starts to build inside someone.

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