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hoarsen vt.使(嗓子)嘶啞。vi.(嗓子)變嘶啞。

hoarstone

Returning home , yu rang cut off his eyebrows and beard , and swallowed burning charcoal to hoarsen his throat , in order to escape recognition both in appearance and voice 豫讓回去后,剃去眉毛和胡子,又吞食熱炭,把聲音弄嘶啞,以便從形象到聲音都不讓人認出來。