This idiom means "to feel sad, to be morose"
to feel blue
______ with envy
green
This idiom means "to reveal your real character"
to show your true colors
This idiom means to criticize someone while having that same fault yourself
pot calling the kettle black
This idiom means "lots of documents, unnecessary bureaucracy"
red tape
Once in a blue ______
moon
The _____ is always greener on the other side
grass
This idiom means "sometimes, rarely"
Once in a blue moon
______ blood
blue
This idiom means "to owe money"
to be in the red