take the bull by the horns: face up to problem instead of avoiding it ( I decided to take the bull by the horns and tell him he was upsetting Jane.)
a wild goose chase: a search that has no chance of success ( I didn't know her flight number so trying to find Amy at Heathrow was a bit of a wild goose chase.)
chicken out: stop participating in something which is too dangerous or difficult.
They are short of funds so I think they're going to chicken out of this project.
not hurt a fly - To be very gentle (not violent) He has an awful temper but he wouldn't hurt a fly.
