Principal English Translation: 

one’s cutting instrument (see Karttunen), a necessarily possessed form

Frances Karttunen: 

-TLATEQUIYA necessarily possessed form one’s cutting instrument / el instrumento con que yo corto algo, mi chuchillo, mi hacha (C for first pers. sg. possesor) [(2)Cf.50r,82r]. C states that this possessed form is suppletive with the absolutive form of synonymous TLATECŌNI. See TEQU(I).
Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 296.