co·op·er·ate 
/koʊˈɑ:pəˌreɪt/ verb
co·op·er·ates; co·op·er·at·ed; co·op·er·at·ing /koʊˈɑ:pəˌreɪt/ verb [no obj] 1 : to work together : to work with another person or group to do something
▪ It will be much easier if everyone cooperates. ▪ Several organizations cooperated in the relief efforts. ▪ The country agreed to cooperate with the other nations on the trade agreement. 2 a : to be helpful by doing what someone asks or tells you to do
▪ The mother asked the child to put on his pajamas, but the child refused to cooperate. ▪ Witnesses were willing/unwilling to cooperate. — often + with ▪ They said they would cooperate fully with the investigation. ▪ He agreed/refused to cooperate with the police.
b : to act in a way that makes something possible or likely : to produce the right conditions for something to happen
▪ We can barbecue on Sunday if the weather cooperates. [=if the weather is good enough]
▪ It will be much easier if everyone cooperates. ▪ Several organizations cooperated in the relief efforts. ▪ The country agreed to cooperate with the other nations on the trade agreement.
▪ The mother asked the child to put on his pajamas, but the child refused to cooperate. ▪ Witnesses were willing/unwilling to cooperate. — often + with ▪ They said they would cooperate fully with the investigation. ▪ He agreed/refused to cooperate with the police.
b : to act in a way that makes something possible or likely : to produce the right conditions for something to happen
▪ We can barbecue on Sunday if the weather cooperates. [=if the weather is good enough]
