v. 25B6; verb HINDER, obstruct, hamper, hold back/up, delay, interfere with, disrupt, retard, slow (down); block, check, stop, thwart, frustrate, baulk, foil, derail; Brit. throw a spanner in the works; N. Amer. throw a monkey wrench in the works; informal stymie; Brit. informal scupper; N. Amer. informal bork; dated cumber.
facilitate.