Crux

The crux of his argument can be found on p. 56.

That's the crux of the matter.

Here's the crux of the problem.

The crux of the matter is poverty, not responsibility.

This seems to be the crux of the whole matter.

The crux of her argument was that the roadways needed repair before anything else could be accomplished.

The mad certitude of the ogre, Abel Tiffauges, that he stands at the crux of history and that he will be able to raise Prussia "to a higher power" (p. 180), contrasts sharply with the anxiety and doubt attendant upon most modern literary dreams.

The movie hits its dramatic crux an hour in, when Reality [Winner], at work at the contractor’s facility in Georgia, discovers what she deems a tragic scandal.

What I have advanced upon this species of verse will contribute to solve a poetical problem, thrown out by Dryden as a crux to his brethren

The perpetual crux of New Testament chronologists.