Well, there is good news and bad news. The bad news is that if a squeeze is fully developed and in place, there is no such thing as a defense against it. That's what a squeeze is all about. You must give up a winning potential in one suit or another as declarer awaits your decision. If declarer isn't in a position to force that, then he doesn't have a squeeze -- yet. The good news is that an easy majority of squeezes (my opinion) could have been inhibited by a defensive play earlier in the hand. So the title should be something like: Defense Against the Threat of a Squeeze While There is Still Time to Thwart it. But I figured the spirit of the shorter title would be understood by the reader. Then there are the pseudo-squeezes, where the defense doesn't have to give up any potential -- if it can get a handle on what suits to discard, what ones to keep. What to do then is also discussed.
In any event, certain it is that a good many squeezes could have been prevented. Now, that's not to say it's rather easy to spot those times. Good heavens, no, particularly when we reflect that the opening lead is traditionally the most difficult play in bridge to get "right", if by right we mean the most effective lead possible. Still, if it isn't easy, that's not to say it's useless to look at how various strategies would have worked. After all, if we raise our percentage of finding the right play from one out of 10 times in these difficult situations to two out of 10 times, we've moved forward a little, have we not?
With that in mind, on to various ways squeezes can be inhibited.