overadjustment

The story

1. Proto-Indo-European*úp
2. Proto-Indo-European*upér
3. Proto-Germanic*uber
4. Old Englishofer-
5. Middle Englishover-
6. Englishover-
7. Proto-Indo-European*h₂ey-
8. Proto-Indo-European*h₂óyu
9. Proto-Indo-European*h₂yew-
10. Proto-Indo-European*h₂yéwos
11. Proto-Italic*jowos
12. Latiniūstu
13. Old Frenchjuste
14. Frenchjuste
15. Frenchajuster
16. Frenchajustement
17. Englishadjustment
18. English todayoveradjustment

From over- + adjustment.