Under a cloud (of suspicion)
Not trusted, suspected of doing something wrong.The politician is under a cloud of suspicion over the possibility of taking bribes.
Under a cloud
Depressed, sad.The woman has been under a cloud of depression since her cat died.
Unrequited love
Love that is not returned, one-way love.The woman was in love with the president of her company but it was unrequited love. He did not love her.
Unaccustomed to (someone or something)
Not used to someone or something.The man was unaccustomed to waking up early in the morning.
Ugly duckling
An ugly or plain child who grows up to be attractive.The girl was an ugly duckling when she was a child but now she is very beautiful.
Up to (somewhere)
As far as, as deep or as high as.The water in the swimming pool came up to my waist.
Up to (something)
To be occupied in or planning some activity that is often bad.I do not know what the boy was up to last night but it was probably something bad.
Up to (someone) to do (something)
To be responsible to do something.It is up to the manager to clean the apartment lobby.
Up to (someone) to decide (something)
To be responsible to choose or decide something.It is up to the manager to decide when the meeting will start.
Up to snuff
Meeting normal standards, equal to the usual level or quality.When I get my computer skills up to snuff I will look for a job to use them.