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 Costs an arm and a leg 4 All that glitters is not gold 5 Once in a blue moon 6 Apple of my eye 7 A pig with lipstick, is still a pig 8 Barking up the wrong tree 9 As mad as a hatter 10 As red as a beetroot