The idiom "strike a chord" means to cause a strong emotional response or to resonate with someone. It is often used when something someone says or does reminds you of a personal experience or feeling.
For example, if someone tells a story about their struggle with anxiety and it reminds you of your own experience with anxiety, you might say "that really struck a chord with me." This means that their story resonated with you and brought up strong emotions or memories.
You can also use this idiom in a more general sense. For example, if a song or a movie really speaks to you and makes you feel emotional, you could say "that really struck a chord with me."
Overall, "strike a chord" is a useful idiom for expressing a strong emotional connection to something.
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