pretend to; act as ifUsed to act as though something is true. The noun or phrase before 振りをする describes what someone pretends to be or do. For example, 大人の振りをする means “pretend to be an adult.”
JA: 彼は上司がそばにいる時は熱心な振りをする。
EN: He pretends to be diligent when his boss is nearby.