kick up one`s heels - have a good time, celebrate We kicked up our heels at the farewell party that we attended last week. a kickback - money paid illegally for favorable treatment The construction company gave the politician an illegal kickback in order to win the contract. . kid around (with someone) - tease and joke with someone The students were kidding around with the teacher after the class. kid's stuff - a very easy task It was kid's stuff. We were able to fix the stove very easily. kill off (something) - kill or end completely, destroy The pollution in the river has killed off all of the.