'anti-dumping' is formed from the prefix 'anti-' (from Greek anti- meaning 'against') combined with 'dumping', the gerund/noun formed from the verb 'dump' used in the commercial sense 'to sell at very low prices'.

'anti-' (Greek) was attached to the commercial sense of 'dumping' (a 20th-century sense of 'dump' meaning 'to sell cheaply or unload goods quickly at a loss'), producing the compound term 'anti-dumping' in trade law and policy language in the mid-20th century.

Originally, 'dump' primarily meant 'to drop or unload' (older senses), but by the 20th century it gained the commercial meaning 'to sell at excessively low prices'; 'anti-dumping' evolved to mean measures taken 'against' that commercial practice.