mǒ​hēi

blacken

抹黑 mǒ​hēi
blacken verb
to apply black substance to a surface, such as a face for camouflage

Special forces soldiers blacken their faces before performing night missions.

black out verb
to obliterate or cover up text or images, often for censorship

Sensitive information in the official document was blacked out with ink.

defame verb
to discredit, defame, smear someone's reputation, or bring shame upon oneself or others

He deliberately spread rumors online to smear his opponent.

Frequency

Movie subtitles
1.37 per million appears in 1% of films
Written text
1.45 per million

Sources

Definitions
CC-CEDICT