Learn what "my heart was" means, when people say it, and how to use it naturally in English.

It means the speaker was extremely startled or nervous when they heard the knock.
From Tied By Fate, Episode 8
Someone reacts strongly after hearing a knock at the door.
Use this as a vivid way to describe fear or sudden shock. It is common in storytelling, but not very literal.
Scenes unlock real expressions as you watch
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