to make dark or darker.

to make obscure.

to make less white or clear in color.

to make gloomy; sadden

He darkened the festivities by his presence.

to make blind.

to become dark or darker.

to become obscure.

to become less white or clear in color.

to grow clouded, as with gloom or anger.

to become blind. ?

darken someone's door

to come to visit; make an appearance

Never darken my door again!

verb

brighten , illuminate , lighten , whiten

verb

becloud , bedim , blacken , cloud over , cloud up , deepen , dim , eclipse , fog , gray , haze , make dim , murk , obfuscate , obscure , overcast , overshadow , shade , shadow , tone down * , adumbrate , benight , cloud , confuse , discolor , dull , gloom , infuscate , perplex , sully , tarnish , tint , umber