to secretly enter, or sneak into somewhere (see Molina)
Alonso de Molina:
ichtaca calaquiliztli. entrada desta manera. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 32v. col. 1. Thanks to Joe Campbell for providing the transcription.