v. 25B6; verb
ensure that air bricks and vents are not obstructed : BLOCK (UP), clog (up), get in the way of, occlude, cut off, shut off, bung up, choke, dam up; barricade, bar; Brit. informal gunge up.
he was charged with obstructing the traffic : HOLD UP, bring to a standstill, stop, halt, block.
fears that the regime would obstruct the distribution of food : IMPEDE, hinder, interfere with, hamper, block, interrupt, hold up, stand in the way of, frustrate, thwart, baulk, inhibit, hamstring, sabotage; slow down, retard, delay, stonewall, stop, halt, restrict, limit, curb, put a brake on, bridle; N. Amer. informal bork.
clear, facilitate.