a visible collection of particles of water or ice suspended in the air, usually at an elevation above the earth's surface.

any similar mass, esp. of smoke or dust.

a dim or obscure area in something otherwise clear or transparent.

a patch or spot differing in color from the surrounding surface.

anything that obscures or darkens something, or causes gloom, trouble, suspicion, disgrace, etc.

a great number of insects, birds, etc., flying together

a cloud of locusts obscuring the sun.

to overspread or cover with, or as with, a cloud or clouds

The smoke from the fire clouded the sun from view.

to overshadow; obscure; darken

The hardships of war cloud his childhood memories.

to make gloomy.

(of distress, anxiety, etc.) to reveal itself in (a part of one's face)

Worry clouded his brow.

to make obscure or indistinct; confuse

Don't cloud the issue with unnecessary details.

to place under suspicion, disgrace, etc.

to variegate with patches of another color.

to grow cloudy; become clouded.

(of a part of one's face) to reveal one's distress, anxiety, etc.

His brow clouded with anger.

in the clouds

in a condition of absent-mindedness; lost in reverie.

impractical

Their schemes are usually up in the clouds.

on a cloud

Informal . exceedingly happy; in high spirits

On the night of the prom the seniors were on a cloud.

under a cloud

in disgrace; under suspicion

After going bankrupt he left town under a cloud.

verb

clear , unfog , unveil , clear up , explain , explicate

noun

billow , brume , darkness , dimness , film , fog , fogginess , frost , gloom , haze , haziness , mare’s tail , mist , murk , nebula , nebulosity , obscurity , ol’ buttermilk sky , overcast , pea soup , pother , puff , rack , scud , sheep , smog , smoke , smother , steam , thunderhead , vapor , veil , woolpack , army , dense mass , flock , horde , host , legion , multitude , rout , scores , shower , swarm , throng , drove , mass , mob , ruck , score , altocumulus , altostratus , blemish , cat\'s-tail , cirro-cumulus , cirro-stratus , cirrocumulus , cirrostratus , cirrus , cloudiness , cumulo-stratus , cumulonimbus , cumulus , eclipse , mare\'s-tail , nimbostratus , nimbus , stigma , storm scud , stratocumulus , stratus , tarnish , wane cloud

verb

adumbrate , becloud , befog , blur , darken , dim , eclipse , envelop , fog , gloom , mist , obfuscate , overcast , overshadow , shade , shadow , veil , addle , befuddle , disorient , distort , distract , impair , muddle , muddy , obscure , perplex , puzzle , bedim , blear , dull , befoul , besmear , besmirch , bespatter , denigrate , dirty , smear , smudge , smut , soil , spatter , stain , sully , taint , tarnish , billow , blacken , blemish , cirrus , confuse , cover , cumulus , dust , film , haze , hide , nebula , nimbus , obnubilate , ominous , screen , seed , smog , stigma , stratus , swarm , thunderhead , vapor