snfj

Etymology
.

Verb

 * 1)  to let breathe or vent out

Inflection
Allen instead treats this verb as a causative strong triliteral, based on the variant form of its stem verb ; in this case the final consonant is unwritten because it is weak:

However, writings of the verb with a final are unattested, unlike writings with a final, and the writing of the verb  itself is very rare and only occurs since the New Kingdom (compared to early Middle Kingdom attestations of ), so this is perhaps unlikely.