WordNet sense 1 (someone employed in a stable to take care of the horses):

hostler, stableman, ostler, stableboy

WordNet sense 2 (a man participant in his own marriage ceremony):

bridegroom

WordNet sense 3 (prepare (someone) for a future role or function):

prepare, train

WordNet sense 4 (give a neat appearance to):

curry, dress

WordNet sense 5 (care for one's external appearance):

neaten