pains
"Pains" is a fascinating word because it works in more than one way. As the plural of "pain", it can refer to physical or emotional suffering. But it also has a completely separate meaning related to effort and care — and that one surprises many learners! Here are the most common and useful senses.
This is the sense that surprises people most! When someone takes 'pains' to do something, it means they put in a lot of careful effort and attention. It has nothing to do with hurting — it is about working hard and being thorough. You will often see the phrase 'take pains' or 'take great pains'.
everyday language, formal writing · Modern, widely used — slightly formal · figurative
Yes, 'pains' can also be a verb! When something 'pains' you, it causes you emotional hurt or discomfort. It is a more formal or literary way of saying something upsets or troubles you. You will often see it in the structure 'it pains me to...'
formal language, literature · Formal, more common in older or literary texts — but still used today · figurative