Definition of pains noun from the Oxford Advanced American Dictionary

 

pains

 noun
noun
NAmE//peɪnz//
 
[plural]
 
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Idioms
be at pains to do something
 
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to put a lot of effort into doing something correctly She was at great pains to stress the advantages of the new system.
take (great) pains (to do something),go to great pains (to do something)
 
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to put a lot of effort into doing something The couple went to great pains to keep their plans secret.
take (great) pains with/over something
 
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to do something very carefully He always takes great pains with his lectures.
See the Oxford Advanced Learner's Dictionary entry: pains