A subject can be identified by observing its habitual characteristics.

Alternative form of if it looks like a duck, swims like a duck, and quacks like a duck, then it probably is a duck

Alternative form of wear rose-colored glasses

Alternative form of wear rose-colored glasses

One should not unappreciatively question or inspect a gift too closely.

Alternative form of don't look a gift horse in the mouth

Alternative form of look like something the cat dragged in

Alternative form of see past the end of one's nose

Alternative form of see past the end of one's nose

Alternative form of see past the end of one's nose