[uhn-der-doo] 
| to do less or in a lesser fashion than is usual or requisite. |
| un·der·do (ŭn'dər-dōō') tr.v. un·der·did (-dĭd'), un·der·done (-dŭn'), un·der·do·ing, un·der·does (-dŭz') To do to an insufficient degree, especially to cook for too short a time. |
dərˈdu