Noun:
1: cloud any collection of particles (e.g., smoke or dust) or gases that is visible
2: cloud a visible mass of water or ice particles suspended at a considerable altitude
3: cloud out of touch with reality; "his head was in the clouds"
4: cloud a cause of worry or gloom or trouble; "the only cloud on the horizon was the possibility of dissent by the French"
5: cloud suspicion affecting your reputation; "after that mistake he was under a cloud"
6: cloud, swarm a group of many insects; "a swarm of insects obscured the light"; "a cloud of butterflies"
Verb:
1: overcast, cloud make overcast or cloudy; "Fall weather often overcasts our beaches"
2: fog, obnubilate, obscure, cloud, befog, becloud, mist, haze over make less visible or unclear; "The stars are obscured by the clouds"
3: cloud billow up in the form of a cloud; "The smoke clouded above the houses"
4: cloud make gloomy or depressed; "Their faces were clouded with sadness"
5: cloud, sully, corrupt, taint, defile place under suspicion or cast doubt upon; "sully someone's reputation"
6: cloud, dapple, mottle colour with streaks or blotches of different shades
7: cloud make milky or dull; "The chemical clouded the liquid to which it was added"