Definition of pains noun from the Oxford Advanced Learner's Dictionary

 

pains

 noun
noun
BrE BrE//peɪnz//
 
; NAmE 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.
for your pains
 
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(especially British English, often ironic) as payment, reward or thanks for something you have done I told her what I thought and got a mouthful of abuse for my pains!
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 American Dictionary entry: pains