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Yada yada
Year dot - The
Yellow-belly 
Yellow Peril
You are what you eat
You can lead a horse to water but you can't make it drink
You can lead a whore to culture but you can't make her think
You can't get blood out of a stone
You look as if you've been dragged through a hedge backwards
You'll wonder where the yellow went when you brush your teeth with Pepsodent
Your money or your life
Your name is mud
You've never had it so good
Zero tolerance
Zig-zag