The word “curbing” is the gerund or present participle form of the verb “curb.” It generally means to restrain, control, or limit something. In a literal sense, it can refer to the act of placing a curb (a raised edge along a street) to confine or guide traffic. In a more figurative sense, “curbing” can refer to reducing or restricting undesirable behaviors or activities, such as curbing spending or curbing excessive emotions.