Cutting teeth is a phrase used to describe the process of learning or gaining experience in a particular field. It is often used to refer to the process of gaining experience in a job or profession, as well as the process of learning a new skill. The phrase 'cut teeth' is derived from the idea that when a baby is teething, they are cutting through their gums and emerging with their first set of teeth. In the same way, when someone is cutting teeth in a new field, they are learning and gaining experience in that field.