" Can I remove "a" from the sentence above? Yes, but it will sound extremely old-fashioned and literary, like something out of an old play or novel. If you do, it's like the person you are speaking to used 'coward' to you as a title, I'd write it thus: How dare you call me ' coward ' .
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.