to swim fast, quickly (see Molina, who gives the example in the first person singular)
Orthographic Variants:
atlã ninotlamina
Alonso de Molina:
atlan ninotlamina. (pret. atlan oninotlamin.) nadar reziamente. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 8r. col. 2. Thanks to Joe Campbell for providing the transcription.