The phrase "give a thrashing" refers to physically punishing or beating someone as a means of discipline or revenge. There are many synonyms for this phrase, including "give a whipping," "give a beating," "give a bashing," "give a drubbing," "hand out a pummeling," and "lay into." Other similar expressions might include "teach a lesson," "show someone who's boss," "put someone in their place," or "make someone pay." While physical violence should never be condoned or encouraged, these phrases convey a sense of force and authority that may be useful in certain contexts, particularly when dealing with unruly or disrespectful behavior.