Emily Dickinson Lexicon

BIG, a. [In W. baic is a load; beiciaw, to load or lay on; beiciawg, pregnant; and bog, is a swelling; buciaw, to bellow; Dan. bug, the belly. These words seem to be allied to big, but I have not found this word in any other language.]

1. Bulky; protuberant; pregnant, applied to females. Big, in the sense of pregnant, is followed by with; as, big with child. The use of of, big of child, is not good English.
2. Great; large; in a more general sense; applied to any body or object.
3. Full; fraught, and about to have vent, or be brought forth. The important day, big with the fate of Rome. – Addison.
4. Distended; full, as with grief or passion. Thy heart is big, get thee apart and weep. – Shak.
5. Swelled; tumid; inflated, as with pride; hence, haughty in air or mien, or indicating haughtiness; proud; as, big looks; big words; to look big.
6. Great in spirit; lofty; brave. Have not I a heart as big as thine? – Shak.