for something to be in front of me and threatening me (see Molina)
Alonso de Molina:
ixtentla momalacachotinemi. n. estar delante de mi algo amenazandome. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 47v. col. 2. Thanks to Joe Campbell for providing the transcription.