Matching Pairs IDIOMS. COLORSOnline version IDIOMS. COLORS by María Marteles 1 Caught red-handed 2 To be a black sheep 3 Gray area 4 To have a green thumb 5 Green with envy 6 To tell a white lie 7 Take the red eye 8 Once in a blue moon 9 Out of the blue 10 To be tickled pink something that is unclear, undefined to be skilled at gardening to be very jealous, envious a late night flight that arrives early in the morning to be extremely pleased to be the outcast, odd one out, unlike the others to catch someone in the act of doing something randomly, without warning, surprisingly very rarely a small lie that is told to be polite or avoid hurting someone’s feelings