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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 new company policies will take effect on the first day of next month.
The anesthesia took effect, and he was out like a light before the surgery began.
As the medication took effect, the sharp pain in his leg dimmed to a dull ache, allowing him to finally relax.
The changes in diet and exercise started to take effect, and he felt healthier.
The government announced that the tax changes would take effect immediately upon approval.