Longman Dictionary of Contemporary English homepage

supplement

2 verb
     
sup‧ple‧ment2 [transitive]
to add something, especially to what you earn or eat, in order to increase it to an acceptable level
supplement something by/with something
Kia supplements her regular salary by tutoring in the evenings.
—supplementation noun [uncountable]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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