Entry 2 senses · 2 variants Webster, 1913 Overslow · O·ver·slow · IPA /əʊvə(ɹ)ˈsləʊ/ v. t. a. 01 v. t. To render slow; to check; to curb. 1. To render slow; to check; to curb.[Obs.] 02 a. Too slow. 1. Too slow.