to drink

strokes 13
strokes after radical 9
歃血 歃血 sha4 xue4
to smear one's lips with the blood of a sacrifice as a means of pledging allegiance (old)

歃血为盟 歃血為盟 sha4 xue4 wei2 meng2
to smear the lips with blood when taking an oath (idiom); to swear a sacred oath