unsake

The story

1. Proto-Germanic · inherited from*ansakaną
2. Old English · inherited fromonsacan“to attack, strive against”
3. Middle English · inherited fromonsaken
4. English todayunsake

From Middle English onsaken, from Old English onsacan (“to attack, strive against”), from Proto-Germanic *ansakaną, *andsakaną (“to resist, object”), equivalent to un- + sake. Cognate with Old Saxon andsakan, antsakan (“to deny, defend oneself”).