Definition of elbow grease in English English dictionary
Effort or hard work, especially physical work involving repeated motion of the forearm, such as scrubbing
When we were young we used to be told, in our house at home, that elbow-grease was the one essential necessary to getting a tough piece of work well done. If a mahogany table was to be made to shine, it was elbow-grease that the operation needed.
People use elbow grease to refer to the strength and energy that you use when doing physical work like rubbing or polishing. It took a considerable amount of polish and elbow grease before the brass shone like new. Strenuous physical labor and effort
use of physical or mental energy; hard work; "he got an A for effort"; "they managed only with great exertion"