[Entity]

I don't see any reads that indicate you're afraid of a bluff checkraise -- just that he's aggressive -- and you're giving up far too much by checking here with what will be 6 outs one way against you but far too often 6-12 outs multiways in a 7 bet pot.

Checking here is giving up far too much. And I'm really surprised that people think villain is going to be bluff checkraising with KQo all that often here. When was the last time you were 3-bet by a solid player and you check-called a flop bet on a 456 board with KQo intending to checkraise a turned Ace in a 3-way pot? If the answer is "recent" you very well may want to recheck your game for leaks.

Rob