A).a fighting against a shadow: esp. a form of exercise with hands and feet, Ph. 1.153 .
2). metaph., fighting with a shadow, mock-fight, 'beating the air', Cic.Fam. 11.14.1 (pl.), Plu. 2.514d , Eust. 663.16 ; title of satire by Varro, Non. p.190 L.—σκιομαχία is a later form, Gal. 6.146 .