In another firm the workers were constantly complaining about the malfunctioning heating system, but the owners was too busy or too mean to do anything about it.
出自-2011年6月听力原文
英语六级真题
Protein supplements may overburden some internal organ, thus leading to its malfunctioning.
2019年12月六级真题（第二套）阅读 Section B
柯林斯高阶英汉双解学习词典释义
VERB
（机器）失灵，出故障；（人体器官）机能失常，出现功能障碍
If a machine or part of the body malfunctions, it fails to work properly.