The meaning of USE is to put into action or service : avail oneself of : employ —often used with for; often followed by to + a verb. How to use use in a sentence. She quickly used up (all of) her inheritance.

Understanding the Context

Don't shower too long and use up (all) the hot water. A use of a word is a particular meaning that it has or a particular way in which it can be used. There are new uses of words coming in and old uses dying out.