lone wolf → one-horse race
a lone wolf (a person who likes to live alone): Although John is a lone wolf, we all like him very much.
a mare’s nest (a very complicated situation): The law on restrictive trade is a mare’s nest.
angry as a bear (very angry): Don’t go near him because he is angry as a bear right now.
angry as a bear (very angry): He is angry as a bear right now.
ants in your pants (to be restless or impatient): The kids have ants in their pants.