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月聽力原文
英語六級真題
Protein supplements may overburden some internal organ, thus leading to its malfunctioning.
2019年12月六級真題（第二套）閱讀 Section B
柯林斯高階英漢雙解學習詞典釋義
VERB
（機器）失靈，出故障；（人體器官）機能失常，出現功能障礙
If a machine or part of the body malfunctions, it fails to work properly.