WordNet sense 1 (cause to rise up):

rear

WordNet sense 2 (construct, build, or erect):

raise, put up, set up

WordNet sense 3 (erect in posture):

straight

WordNet sense 4 (having a supporting base):

standing

WordNet sense 5 (upright in position or posture):

upright, vertical

WordNet sense 6 (of sexual organs; stiff and rigid):

tumid

WordNet sense 7 (resisting weight or pressure):

hard