positively regulates unidimensional cell growth positive regulation of cell morphogenesis positive regulation of cell growth positive regulation of developmental growth regulation of unidimensional cell growth positive regulation of unidimensional cell growth up-regulation of unidimensional cell growth activation of unidimensional cell growth upregulation of unidimensional cell growth Any process that activates or increases the frequency, rate or extent of unidimensional cell growth, the process in which a cell irreversibly increases in size in one [spatial] dimension or along one axis. stimulation of unidimensional cell growth GO:0051512 biological_process positive regulation of cell elongation up regulation of unidimensional cell growth biological regulation