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