Senses
有一手儿/ 有一手兒 to have a trick up one's sleeve
to be skilled or proficient at something; to have a clever knack for a specific task
有一手儿/ 有一手兒 to have an affair
to have an illicit or improper relationship with someone
有一手儿/ 有一手兒 to collude with
to gang up with someone; to be in cahoots or league with