to sink one's teeth into something or take a bite (see Molina)
Alonso de Molina:
campoxoa. nite. (pret. onitecampoxo.) adentellar, o dar bocado. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 12r. col. 2. Thanks to Joe Campbell for providing the transcription.