[{"Bold_text": "verb (used with object)", "List Items": ["to bite or chew on, especially persistently.", "to wear away or remove by persistent biting or nibbling.", "to form or make by so doing:to gnaw a hole through the wall.", "to waste or wear away; corrode; erode.", "to trouble or torment by constant annoyance, worry, etc.; vex; plague."]}, {"Bold_text": "verb (used without object)", "List Items": ["to bite or chew persistently:The spaniel gnawed happily on a bone.", "to cause corrosion:The acid gnaws at the metal.", "to cause an effect resembling corrosion:Her mistake gnawed at her conscience."]}]