Cách sử dụng
The word "toughen" means to make something stronger or harder. It can be used in many different situations such as toughening up a piece of meat by cooking it longer, toughening up your muscles by working out regularly, or toughening up your attitude in a difficult situation. In general, it's a way of making something more resilient or durable. As an English learner, you may come across the word "toughen" in various contexts such as sports, cooking, and personal development.