Cách sử dụng
The expression "a/the fly in the ointment" means a small flaw or problem that ruins a situation which would otherwise be perfect or good. It is often used to describe situations where something or someone spoils the enjoyment of something else. For example, if you are planning a picnic and it starts raining, that could be seen as a fly in the ointment because it spoils the enjoyment of the picnic. Similarly, if you have a great job but your boss is difficult to work with, that could be described as a fly in the ointment.