The word "耳鬓厮磨" is formed by the sequential combination of the nouns "耳" (ear) and "鬓" (temple) to specify closely adjacent body parts, followed by the adverb "厮" (mutually) and the verb "磨" (to rub), which together describe the action of these parts rubbing against each other, literally constructing an image of physical closeness that implies intimacy.