ふりをする

About

～ふりをする is a phrase that means "to pretend to do...", and is simply a combination of ふり (振ふり), which you can think of as "action", the を particle, and the verb する.

〜ふりをする can attach to any casual form verb, or directly to い-adjectives, to nouns using の, or to な-adjectives using な.

E.g. 中山なかやまさんは、お金かねがないのにお金かね持もちのふりをしている。

"Even though he has no money, Yamanaka is pretending that he's rich."

E.g. 知しらないふりをしないで教おしえて。

"Don't pretend you don't know and tell me."

Summary

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  ～ふりをする means "to pretend to do..."

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  〜ふりをする can attach to any casual form verb, or directly to い-adjectives, to nouns using の, or to な-adjectives using な