Verb gnaw has 2 senses
  1. gnaw - bite or chew on with the teeth; "gnaw an old cracker"; "chewed on a cookie"
    --1 is a kind of
    chew, masticate, manducate, jaw; bite, seize with teeth
    Derived form: noun gnawer1
    Sample sentences:
    Somebody ----s something
    Something ----s something
  2. erode, gnaw, gnaw at, eat at, wear away - become ground down or deteriorate; "Her confidence eroded"
    --2 is one way to decay, crumble, delapidate
    Sample sentence:
    Something ----s
,
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