"Knuckleundered" is a unique word that often refers to giving in or submitting to a request or demand with reluctance or resignation. There are plenty of synonyms that convey similar meanings such as caving in, capitulating, succumbing, yielding, acquiescing, relenting, or giving way. These words may differ slightly in their nuances, but they are all used to describe the act of bending to someone else's will. Other synonymous expressions include bending, buckling, backing down, folding, lying down, or throwing in the towel. Although they may connote different degrees of resistance or defeat, all these synonyms illustrate a situation where one surrenders to external pressure or authority.