Emily Dickinson Lexicon

steady, adj. [ON 'stable'; see stead, n.]

1. Firm; steadfast; upright; [fig.] courageous; confident; not nervous.
2. Regular; continuous; wakeless; not digressing.
3. Plain; changeless; undisturbed; monotonous; seemingly endless.
4. Phrase. “Steady”: be calm; fear not; stay composed; [probably a reflexive imperative verb phrase with “steady” as adjectival complement and ellipsis of the “you” subject and the “be” verb] you be steady.