Gnomish
tertha-
verb. to devour, destroy
tercha-
verb. to devour, destroy
Beware, older languages below! The languages below were invented during Tolkien's earlier period and should be used with caution. Remember to never, ever mix words from different languages!
A verb appearing as G. tertha- or tercha- “devour, destroy” in the Gnomish Lexicon, perhaps related to G. terch “worm” [= “✱worm eaten”] (GL/70) and thus ultimately derived from the early root ᴱ√TEŘE “pierce, boring” (PME/91).
Neo-Sindarin: Since √TER “pierce” survives in Tolkien’s later writings, I would retain ᴺS. tertha- “destroy” for purposes of Neo-Sindarin, originally with the sense “✱fill with holes”, but for “devour” I would use ᴺS. ammad-.