Where does “gristbatian” come from?

gristbatian (Old English) comes from Old English batian, from Old English -ol, from Proto-Germanic -ulaz — Forms adjectives from verbs meaning "doing" or...

gristbatian (Old English): to gnash or grind the teeth

Definitions

to gnash or grind the teeth

Ancestry of “gristbatian”, step by step

gristbatian traces back through two separate lines of ancestry.

via Old English batian

Step	Language	Word	Meaning
1	Old English	batian	to fatten, to get fatter; to improve, to get...
2	Old English	-ol	Used to form suffixes denoting inclination or...
3	Proto-Germanic	-ulaz	Forms adjectives from verbs meaning "doing" or...

via Old English grist

Step	Language	Word	Meaning
1	Old English	grist	grinding; a grinding
2	Proto-Germanic	gredaną	to crunch
3	Proto-Indo-European	gʰrew-	to grind, rub; to rub, grind; to weep, be sad

Every word from Proto-Germanic -ulaz →Every word from Old English -ol →Every word from Old English batian →