1 cloud /ˈklaʊd/ noun
plural clouds
1 cloud
plural clouds
Learner's definition of CLOUD
: a white or gray mass in the sky that is made of many very small drops of water
see also mushroom cloud, storm cloud
: a large amount of smoke, dust, etc., that hangs in the air
: a large group of things (such as insects) that move together through the air
: a feeling or belief that a person or organization has done something wrong
: the large computers (called servers) that you can connect to on the Internet and use for storing data

cast a (dark) cloud

: to cause people to stop trusting something

cloud on the horizon

: a problem that could appear in the future

every cloud has a silver lining

see silver lining

in the clouds

◊ If you are in the clouds or you have your head in the clouds, you spend too much time thinking about love or about ideas that are not practical.

on cloud nine

: very happy
2 cloud /ˈklaʊd/ verb
clouds; clouded; clouding
2 cloud
clouds; clouded; clouding
Learner's definition of CLOUD
[+ object] : to confuse (a person's mind or judgment)
[+ object] : to make (something, such as an issue or situation) difficult to understand
[+ object] : to affect (something) in a bad way
[no object] of the sky : to become covered with clouds usually + over
[+ object] : to cover or fill (a room, the sky, etc.) with large amounts of smoke, dust, etc.
[+ object] : to cover (glass, a window, etc.) with many very small drops of water
[no object] of a person's face or eyes : to show that someone is worried or unhappy