Matching Pairs IdiomsOnline version Match the idiom with the correct picture. by Karla Izquierdo 1 To hear something straight from the horse's mouth 2 A chip off the old block 3 Once in a blue moon 4 Apple of my eye 5 As red as a beetroot 6 A pig with lipstick, is still a pig 7 As mad as a hatter 8 Costs an arm and a leg 9 All that glitters is not gold 10 Barking up the wrong tree