overshorten UK /ˌəʊ.vəˈʃɔː.tən/US /ˌoʊ.vɚˈʃɔɹ.tən/ verb1 •To shorten too much; make excessively or inappropriately short.This plant has only a certain capacity for daylight, and to overshorten the nights would injure it. — 1936 formsovershortened · overshortening · overshortens