Principal English Translation: 

to deserve or attain something

Horacio Carochi / English: 

-ilhuilti = to deserve or attain something
Horacio Carochi, S.J., Grammar of the Mexican language with an explanation of its adverbs (1645), translated and edited with commentary by James Lockhart, UCLA Latin American Studies Volume 89 (Stanford: Stanford University Press, UCLA Latin American Center Publications, 2001), 503, and see 228–229.

Attestations from sources in English: 

ylhuil = that which one deserves, merits; deserts (as in "just deserts")
Robert Haskett and Stephanie Wood's notes from Nahuatl sessions with James Lockhart and subsequent research.