一笔抹杀

yī bǐ mǒ shā

to blot out at one stroke

to reject out of hand; to deny without a hearing

一

yī

one

笔

bǐ

writing brush; writing implement (pen, pencil etc) (CL:支[zhi1],枝[zhi1])

抹

mǒ

to smear

杀

shā

to kill; to slay; to murder; to attack