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pain

1 pain /ˈpeɪn/ noun
plural pains
1 pain
/ˈpeɪn/
noun
plural pains
Britannica Dictionary definition of PAIN
: the physical feeling caused by disease, injury, or something that hurts the body
[noncount]
[count]
see also aches and pains at 2ache
: mental or emotional suffering : sadness caused by some emotional or mental problem
[noncount]
[count]
see also growing pains
[singular] informal : someone or something that causes trouble or makes you feel annoyed or angry
often used in phrases like pain in the neck or (impolite) pain in the ass

be at pains

: to try hard to do something

feel no pain

see 1feel

go to great pains

or take (great) pains
: to be careful in doing something : to try hard to do something followed by to + verb

no gain without pain

see 2gain

no pain, no gain

see 2gain

on/under pain of

formal
: at the risk of being given (a particular form of punishment)
2 pain /ˈpeɪn/ verb
pains; pained; paining
2 pain
/ˈpeɪn/
verb
pains; pained; paining
Britannica Dictionary definition of PAIN
[+ object] formal
: to cause (someone) to feel emotional pain : to make (someone) upset, sad, worried, etc.