Learn what "you acted fast the other day" means, when people say it, and how to use it naturally in English.

It means the speaker is pointing out that someone moved or responded quickly recently.
From Help! I’m Falling In Love With My Rude CEO, Episode 18
Someone comments that the other person acted quickly a few days ago.
Use this to comment on someone’s quick action or decision in a normal conversation. It is neutral and can sound a little vague without context.
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