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to take effect
01
(of an action, process, or change) to begin to produce the intended results or outcome
02
(of a rule, law, or policy) to officially become valid and enforceable
Example
The treatment will gradually take effect and improve her condition over time.
The government announced that the tax changes would take effect immediately upon approval.
The new law will take effect on January 1st of next year.
The changes in diet and exercise started to take effect, and he felt healthier.
The anesthesia took effect, and he was out like a light before the surgery began.