Longman Dictionary of Contemporary English homepage

memory hog

 noun
     
Related topics: Computers
memory hog [countable] informal
1TD a computer program that uses a lot of memory
2TD someone who uses computer programs that use a lot of the power available, so that other people on the network have trouble using their programs
—memory-hogging adjective [only before noun]
Definition from the Longman Dictionary of Contemporary English
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