the lip(s), the mouth; the voice; word(s); the border, the edge
See some of our additional entries beginning with ten-, which can show the broader reading of tentli as mouth, not just lips. Some hieroglyphs also seem to emphasize the jaw.
motenholcupinticac = her lips are painted with rubber
ca mocamacpa oallatoa, ca tiiten ca tiicamachal, ca tiinenepil = he speaketh forth from thy mouth. Thou art his lips, thou art his jaw, thou art his tongue (central Mexico, sixteenth century)
amo popoloc, amo tentzitzipi, amo tentzitzipitlatoa = neither one who stammered, nor [one who talked] as if his tongue were pierced for a ring; nor one with welts on his tongue (16th century, Mexico City)
nelli yten ytlatol = en verdad es su voz y su palabra (Tlatelolco, 1573)