под гребёнку стричь кого-что, стрижкаPrepPInvaradv or nonagreeing modif ) (to cut s.o. 's hair etc) very short: (s.o.'s hair is) close croppeda close-cropped haircut(wear one's hair) cropped closecrop s.o. 's hair(wear (give s.o. )) a crew cut.
...Он стриг волосы под гребёнку, и неровности его черепа, обнажённые таким образом, поразили бы френолога странным сплетением противоположных наклонностей (Лермонтов 1). His hair is close cropped, and shows up the bumps of his skull, which would astonish a phrenologist by their strange mixture of opposing tendencies (lc). . ..He wore his hair cropped close, and the irregularities of his skull thus exposed would have astounded a phrenologist by their queer combination of contradictory inclinations (1b).