Cách sử dụng
The expression "somebody's best/strongest/winning card" means the most advantageous or most effective strategy, resource or piece of information that someone has to accomplish a goal or win a competition. It is usually used in situations where someone needs to use their most powerful asset to succeed. For example, in a job interview, your skills and experience could be your best card, or in a game, a particular move or strategy could be your winning card.