blacken
US /ˈblæk.ən/
UK /ˈblæk.ən/
1.
黒くなる
to become black or to make something become black, for example because of dirt or smoke:
:
•
The folds of the curtains were blackened with dirt.
黒くなる
to become black or to make something become black, for example because of dirt or smoke: