ahuachia.

Headword: 
ahuachia.
Principal English Translation: 

to spray something with water; or, to splash or spray oneself with water, to take a shower; or, or to put water on the floor before sweeping it

Orthographic Variants: 
auachia
IPAspelling: 
ɑhwɑtʃiɑː
Alonso de Molina: 

auachia. nin. (pret. oninauachi.) rociarse con agua.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 9r. col. 2. Thanks to Joe Campbell for providing the transcription.

auachia. nitla. (pret. onitlaauachi.) rociar algo, o regar para barrer.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 9r. col. 2. Thanks to Joe Campbell for providing the transcription.

auachia. nite. (pret. oniteauachi.) rociar a otro.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 9r. col. 2. Thanks to Joe Campbell for providing the transcription.

Frances Karttunen: 

AHHUACHIĀ vt to irrigate, sprinkle something / rociar a otro (M) See AHHUACH-TLI.
Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 5.

Attestations from sources in English: 

ahuachia (v) = to wet one's self, to bathe
Daniel Garrison Brinton, Ancient Nahuatl Poetry: Containing the Nahuatl Text of XXVII Ancient Mexican Poems (1887), 149.

themes: 
Cleanliness, Orderliness
Water