S: (n) cloud (a cause of worry or gloom or trouble) "the only cloud on the horizon was the possibility of dissent by the French"
S: (n) cloud (suspicion affecting your reputation) "after that mistake he was under a cloud"
S: (n) swarm, cloud (a group of many things in the air or on the ground) "a swarm of insects obscured the light"; "clouds of blossoms"; "it discharged a cloud of spores"
Verb
S: (v) overcast, cloud (make overcast or cloudy) "Fall weather often overcasts our beaches"