rain like cats and dogs.
Let sleeping dogs lie - don't stir things up unnecessarily
"I've got a mouth like the bottom of a budgie's cage."
(budgie = budgerigar = parrakeet)
"I've got a mouth like a monkey's armpit."
both mean "I've got a foul taste in my mouth."
"tight as a badger's a*s*/*r*e" = very mean with money
These are very informal. I wouldn't advise using them in an exam or a job interview.
''pull a rabbit out of the hat''= suddenly produce something as a solution to a problem
eg. We had almost given up hope when Mick pulled a rabbit out of the hat by coming up with a great new idea.
Forgive me if any of these are already posted
All over the place like a dogs breakfast = Messy
Eat a horse and go back for the rider = hungry
Eat the arse out of a low flying duck = Hungry
Frog in your throat = Croaky voice
Fit as a malley bull
Strong as an ox
Thanks Mad, I just found this the other day and it is a bit of an interest of mine so I shall be lurking and posting here and there ;)
Here's one for the purists;
Beef to the heels like a Mullingar heifer
As rare as hen's teeth: