student asking question

What does "kick in" mean? Is it an Idiom?

teacher

Native speaker’s answer

Rebecca

"Kick in" is a phrasal verb here and means to begin working or to come into effect. In this case, "kick in" is used to explain that herd immunity starts happening and is successful. Ex: She is in pain from the injury but the drugs will kick in soon. Ex: The car has kicked into a higher gear.

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