1) (о льне и т.п.) scutching
2) разг. (побои) thrashing; (нагоняй) dressing-down; (гл. обр. ребенку) scolding
задать кому-л. трепку — to give smb. a (sound) thrashing; to give smb. a dressing-down, to give it (hot) to smb., to scold smb.
трепка нервов — nervous strain, strain on the nerves