挂科 (guàkē) Flunk/ Fail in the exam
The character “挂 (guà)” means failing and “科 (kē)” means subject or a branch of academic or vocational study.
Example:
Yīnwéi méiyŏu nǔlì xuéxí, zhè cì kăoshì Gao Feng yòu guàkē le.
因为没有努力学习，这次考试高峰又挂科了。
Not having studied his lessons very hard, Gāo Fēng failed this exam again.
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