Longman Dictionary of Contemporary English homepage

Date: 1400-1500
Language: Latin
Origin: expendere 'to weigh out, pay', from pendere 'to weigh'

expend

 verb
     
ex‧pend [transitive]
to use or spend a lot of energy etc in order to do something
expend energy/effort/time/resources etc
People of different ages expend different amounts of energy.
Manufacturers have expended a lot of time and effort trying to improve computer security.
expend something in/on (doing) something
A great deal of time and money has been expended on creating a pleasant office atmosphere.
Definition from the Longman Dictionary of Contemporary English
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