1. phrasal verb If something kicks in, it begins to take effect. [V P] ⇒ As discounts kicked in, bookings for immediate travel rose by 15%. [V P] ⇒ When you're confronted with the problem, emotions kick in, fear kicks in, and you don't always do the rational and thought-out approach. 2. phrasal verb → kick If someone kicks in a particular amount of money, they provide that amount of money to help pay for something. [US] [V P n] ⇒ Kansas City area churches kicked in $35,000 to support the event. [V P n (not pron)] ⇒ To keep it going, Lenoire kicked in her own earnings from acting.
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