As a Noun: 1. The fact of no longer having something or of having less of it than you had before. English = loss. 2. In business or finances, a situation in which you earn or make less money than you spend on various activities. English = loss. As a Verb or Adjective: 1. To not know where something is because you cannot remember where you put it or because you have accidentally dropped it. English = lose. 2. To no longer have something, although you would like to have it, often because it has been taken away from you or destroyed. English = lose. 3. To not know where you are or how to get home or to where you want to go. English = lose your way; get lost, (be) lost. 4. To have someone do better than you in a competition or an argument so that you are defeated. English = lose.