secret; shady; unlawful

wicked; sinister; evil

black; dark

(of facial expression) gloomy; glum

edge or blade of a knife

a certain article (as a cistern, a big jar, etc)

person

mouth

open end; opening

crack

KangXi radical 30 (mouth)

entrance; gate (especially in the Great Wall or city walls)

(noun) 1. exit; 2. entrance; (noun) 1. person; (noun) orifice (bottles)

to give a stern or displeased look. It is used to described the expression of somebody when they see or hear something that they don't like.

haak1 saai3 faai3 min6

黑晒塊面

黑面口

or

It is usually expressed as:

haak1 hak1 min6 hau2