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