乘虚 Traditional form: 乘虛 Pinyin (reading): chéngxū Definitions: to take advantage of weakness Characters: 乘 - ride, mount; to make use of; to ascend; to multiply 虚 - false; worthless, hollow, empty; vain Traditional characters: 乘 - ride, mount; to make use of; to ascend; to multiply 虛 - false; worthless, hollow, empty; vain