Merriam-Webster's Collegiate® Dictionary, 11th Edition
GRUDGE
I. transitive verb (grudged; grudging)
Etymology: Middle English grucchen, grudgen to grumble, complain, from Anglo-French grucer, grucher, of Germanic origin; akin to Middle High German grogezen to howl
Date: 14th century
to be unwilling to give or admit ; give or allow reluctantly or resentfully , grudger noun
II. noun
Date: 15th century
a feeling of deep-seated resentment or ill will, see: malice