like a bat out of hell Definition

bat²
noun

1. Any of numerous species of small nocturnal mammals which have a fur-covered body and membranous wings, and in most cases hunt for food in darkness by relying mainly on echolocation.

Idiom: have bats in the belfry

colloq
To be crazy or slightly mad. See also bats, batty.

Idiom: like a bat out of hell

colloq
Very fast.

Etymology: 16c; 14c as bakke.