Phrasal Verb: to kick in = to begin to work or to have an effect: Once the heat kicks in, it will be a lot more comfortable in here. #PhrasalCards ━━━━━━━━━━━━━━━ ☞» @CambridgeWords ☞» @PhrasalVerbsIdioms ☞» @American_English_Club 850 views20:08