The Vietnamese word "cai sữa" refers to the process of weaning, which means helping a baby or young animal stop drinking milk, especially from its mother. It is often used in the context of both children and young animals, such as pigs.
The term can also be used metaphorically to describe the process of helping someone become independent from something they relied on, not just in terms of milk but in other contexts as well. For example, it could refer to someone weaning off a habit or dependence on a particular substance.
While "cai sữa" specifically refers to weaning from milk, the word "cai" can also be used in other contexts to indicate stopping or quitting something, such as "cai thuốc" (to quit smoking) or "cai rượu" (to stop drinking alcohol).