take a lot of doing

Từ điển Oxford Advanced Learner 8th

▪ I. take some ˈdoing | take a lot of ˈdoing idiom
to be hard work; to be difficult
•Getting it finished by tomorrow will take some doing.
Main entry: ↑doing_idiom
 
▪ II. take some/a lot of ˈdoing idiom
(informal)to need a lot of effort or time; to be very difficult to do
Main entry: ↑take_idiom