Cách sử dụng
The word 'thumb' is a noun, which refers to the short and thick finger on your hand that is opposite to your other fingers. You can use it to grip things, like when you hold a pencil or pick up a coin. You can also use it to signal approval by sticking it up, or signal disapproval by pointing it down. In casual conversations, people might say 'thumbs up' or 'thumbs down' to express their opinion or preference. Moreover, it is also used in idioms, like 'rule of thumb' that means a general principle that is based on experience rather than a strict rule.