No, 43
= by turns = in rotation of = one after the other
= alternately
ex) We kept watch by turns ¿ì¸®´Â ±³´ë·Î ¸ÁÀ» º¸¾Ò´Ù.
                    ´äº¯/°ü·Ã ¾²±â     ÀÌÀü±Û ´ÙÀ½±Û           â´Ý±â