Entry 2 senses · 2 variants Webster, 1913 Oversize /ōvˌ-ẽrs-īz'/ · O·ver·size · IPA /ˌoʊvərsˈaɪz/ v. t. v. t. 01 v. t. To surpass in size. 1. To surpass in size. 02 v. t. To cover with viscid matter. 1. To cover with viscid matter.[R.] “O'ersized with coagulate gore.” — Shak.