tlazocamati.

Headword: 
tlazocamati.
Principal English Translation: 

to be thankful, or to thank someone for something; to give thanks, or to be thanked from a received benefit (see Molina)

IPAspelling: 
tɬɑsohkɑːmɑti
Alonso de Molina: 

tlazocamati. nite. (pret. onitetlazocama.) ser agradecido, o agradecer algo a otro.
tlazocamati. nitla. (pret. onitlatlazocama.) dar gracias, o ser agradecido del beneficio recebido.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 118r. col. 1. Thanks to Joe Campbell for providing the transcription.

Frances Karttunen: 

TLAZOHCĀMAT(I) vt; pret: TLAZOHCĀMAH to thank someone for something / ser agradecido o agradecer algo a otro (M) See TLAZOĀ, MAT(I).

TLAZOHCĀMATI expression of thanks gracias, muchas gracias (Z) [(1)Tp.235, (2)Zp.64,214]. In Z this has a final -C . See TLAZOHCĀMAT(I).
Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 306.

Attestations from sources in English: 

Laçogamatone yn dios = Thanks be to God. (Zacualco, 1629)
Beyond the Codices, eds. Arthur J.O. Anderson, Frances Berdan, and James Lockhart (Los Angeles: UCLA Latin American Center, 1976), Doc. 31, 196–197.