gnaw /nɔː/verb 3noun 1forms 7phrases 1 verb3 •To bite something persistently, especially something tough.The dog gnawed the bone until it broke in two. •To produce excessive anxiety or worry.Her comment gnawed at me all day and I couldn't think about anything else. •To corrode; to fret away; to waste.VVots thou vvho's returnd, / The unthrift Bonvile, ragged as a scarre-crovv / The VVarres have gnavv'd his garments to the skinne: […] — 1637 noun1 •The act of gnawing.have a gnaw of a bone formsgnawed · gnew · gnawn · gnawing · gnaweth · gnaws · gnawest Phrases with gnaw gnaw someone's vitalsTo deeply trouble (someone).