This is the 3931st most frequent Japanese word.
サイゼ
"Saize" is a colloquial abbreviation for "Saizeriya," a popular Japanese-Italian casual restaurant chain.
In this sentence, 'サイゼ' is used as the informal shorthand for 'サイゼリア', a popular family-style Italian restaurant chain in Japan. It refers to the place where the lunch took place.
昨日、サイゼで友達とランチを食べました。
Yesterday, I had lunch with friends at Saizeriya.
Here, 'サイゼ' functions as the nickname of the restaurant chain, and the sentence describes its characteristics perceived by customers.
サイゼはメニューが豊富で価格が手頃です。
Saizeriya offers a wide variety of menu options and affordable prices.
In this case, 'サイゼ' is used in a conversational context as a suggestion for the venue of an event.