Longman Dictionary of Contemporary English homepage

malfunction

 noun
     
mal‧func‧tion [countable]
a fault in the way a machine or part of someone's body works:
a malfunction in one of the engines
malfunction of
a malfunction of the immune system
an equipment malfunction
—malfunction verb [intransitive]
A warning light seems to have malfunctioned.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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