Cheeksful vs Like a Cheekful

All the liquids add up to make a mouthful.

Food and drink do not add up.

The Rabbis taught: One may not recite kiddush over beer.

From the name of Rabbi Elazar, son of Rabbi Shimon, they said: "One may recite kiddush."

By tasting any amount of wine.

Rabbi Yosei, son of Yehuda, says: "A cheekful."

How much to drink on Yom Kippur to be liable?

Beit Shammai say: "A quarter-log,"

and Beit Hillel say: "Two cheeks full." Rabbi Yehuda says from the name of Rabbi Eliezer: "Like two cheeks full." Rabbi Yehuda ben Beteira says: "In order to swallow."

Rav Yehudah said: "Shmuel said: 'Not actually cheeksful, rather, all who pushes to one side, and it appears as though his cheeks were full.'"

Rav Huna said: "Rav said -and Rav Giddel from Neresh likewise teaches: 'One who recites kiddush and tastes a cheekful has fulfilled his obligation, and if not, he has not fulfilled his obligation.'"

Rava said: "The elders of Pumbedita stated these two matters: One was this mentioned above with regard to lifting the barrel; and the other was: With regard to one who recites kiddush - if he tasted a mouthful, he fulfilled his obligation; however, if he did not taste a mouthful, he did not fulfill his obligation."

Didn’t we learn in the mishna: A cheekful, in the plural form, meaning two cheeks full?

The Gemara answers: Say: Like two cheeks full in appearance.