空手接白刃徒手画直线
[kōng shŏu jiē bái rèn tú shŏu huà zhí xiàn]
‘Kong Shou Jie Bai Ren Tu Shou Hua Zhi Xian’ describes catching a blade with bare hands and drawing a straight line. It metaphorically shows great courage, risk-taking, or doing things with difficulty against the odds.