3. Having greatness, fullness, importance, inflation, distention, etc, whether in a good or a bad sense; as, a big heart; a big voice; big looks; to look big. As applied to looks, it indicates haughtiness or pride. God hath not in heaven a bigger argument. (Jer. Taylor)
Origin: Perh. From Celtic; cf. W. Beichiog, beichiawg, pregnant, with child, fr. Baich burden, arm. Beac'h; or cf. Oe. Bygly, Icel. Biggiligr, (properly) habitable; (then) magnigicent, excellent, fr. Oe. Biggen, Icel. Byggja, to dwell, build, akin to E. Be.