Emily Dickinson Lexicon

redbreast, n. [see red, n. and breast, n.] (webplay: bird, cheeks, Red Sea, robin, summer).

1. Robin; thrush; bird with ruddy chest and abdomen feathers; [fig.] humble creature; lowly being.
2. Rosy chest and abdomen feathers of a robin; [fig.] optimism; hope; cheerfulness; bright outlook.