to grow large, to aggrandize oneself, to be vain; to enlarge, augment, exaggerate something (see Karttunen); in terms of augmenting, this verb has been seen in the meaning of to make a donation (see attestations)
Annals of His Time: Don Domingo de San Antón Muñón Chimalpahin Quauhtlehuanitzin, James Lockhart, Susan Schroeder, and Doris Namala, eds. and transl. (Stanford: Stanford University Press, 2006), 135.