면 막다

if that happens, block it

A conditional "-(으)면" feeding 막다, "block, stop, prevent". Every line is about a response once something occurs. 막다 stretches across three kinds of blocking and the examples show all three: physically blocking a blow so it doesn't hurt, stopping a policy or a shipment (if Turkey imports weapons, they block it), and taking content down (if people post that sort of thing, they block it).