The word "睁一眼闭一眼" is formed by combining two verb-object phrases: "睁一眼" meaning "to open one eye" and "闭一眼" meaning "to close one eye", linked in a parallel structure to depict the literal action of having one eye open and the other closed; this juxtaposition creates an idiomatic expression implying selective attention or deliberate overlooking, derived directly from the concrete actions described by the characters.