抹不下脸

to be unable to keep a straight face (idiom)

to wipe

to smear / to wipe / to erase / classifier for wisps of cloud, light-beams etc

to plaster / to go around / to skirt

no; not so / (bound form) not; un-

to be not less than (a certain quantity, amount etc)

down / downwards / below / lower / later / next (week etc) / second (of two parts) / to decline / to go down / to arrive at (a decision, conclusion etc) / measure word to show the frequency of an action

face / CL:張|张[zhang1],個|个[ge4]