Use of physical or mental energy; hard work.

synonyms: effort, exertion, sweat, travail.

Roget 331: friction, attrition; rubbing, abrasion, scraping etc. v.; confrication^†, detrition, contrition^†, affriction^†, abrasion, arrosion^†, limature^†, frication^†, rub; elbow grease; rosin; massage; roughness etc. 256.    rolling friction, sliding friction, starting friction.    ... show more

Dutch: krachtsinspanning, inspanning
Polish: próba, usiłowanie