▪ I.ˈunderstep,n. (under-1 5 b.) 1610J. Robinson Justif. Separat. iii. 10 That by it, as by an understep, he might climb up..into the throne of iniquity. ▪ II.underˈstep,v. (under-1 10 a.) 1843Blackw. Mag. LIV. 652 Were such phraseology allowable, we should say that the sphere has understepped itself.