Cách sử dụng
'Stiffen' is a verb that means to become firm or rigid. We use it when talking about things that were once soft but become tough or hard. For example, you could say that the dough will 'stiffen' as you knead it, meaning that it will become less sticky and more firm. Or you might say that your muscles 'stiffen' after a hard workout, meaning that they feel tight and sore.Overall, 'stiffen' is an action that typically refers to something becoming less flexible or more solid.