Browse phrases beginning with:
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Under your hat - Keep it
Get- underway
Uneasy lies the head that wears a crown
The great - unwashed
The - unkindest cut of all
Up a blind alley
Up a gum tree
Up the apples and pears
Up the duff
Up to snuff
Upper crust 
Ups-a-daisy
Upset the apple-cart
Upside down
Urban myth
Usual suspects - The
Using a sledgehammer to crack a nut
Van surfing
Vanish into thin air
Veg out
Verbosity leads to unclear, inarticulate things
Vice versa
Vicious circle
Vis-a-vis
Vorsprung Durch Technik