Meaning of RACKING in English
/rak"ing/ , n. Masonry.
the stepping back of the ends of courses successively from bottom to top in an unfinished wall to facilitate resumption of work or bonding with an intersecting wall.
[ 1890-95; RACK 1 + -ING 1 ]
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012