undouble

un·dou·ble

U0065300 (ŭn-dŭb′əl)tr.v. un·dou·bled, un·dou·bling, un·dou·bles To unfold, as a piece of paper money.

undouble

(ʌnˈdʌbəl) vb (tr) to stretch out or unfold