Matching Pairs C22U4LA Voc Not bOnline version What do these idioms mean? Match the columns. by Modern English 1 be a fish out of water 2 clam up 3 have ants in your pants 4 be in the doghouse 5 beat a dead horse 6 get off your high horse 7 be a guinea pig 8 have butterflies in your stomach not say anything, perhaps because you feel uncomfortable be in trouble stop being superior be the subject of an experiment be nervous not fit in, be out of place waste your time on something be anxious or excited to do something