くちにする
kuchini suru

Suru Verb
Expression

1. to taste; to eat; to drink

Transitive
この みっ日間 かかん なん くちにしていない。
kono mikkakan nanimo kuchini shite inai.
I have eaten nothing for the past three days.
Suru Verb
Expression

2. to speak (of); to put into words; to refer (to); to say

Transitive
そういうことは くちにするな。
sōyū kotowa kuchini suruna.
Don't talk about such a thing.