yī bǐ mǒ shā
variant of 一筆抹殺|一笔抹杀[yi1 bi3 mo3 sha1]
一
yī
one
笔
bǐ
writing brush; writing implement (pen, pencil etc) (CL:支[zhi1],枝[zhi1])
抹
mǒ
to smear
煞
shā
to terminate
