Similar words: snub, nubile, connubial. Meaning: [nʌb] 
n. 1. a small lump or protuberance 2. a small piece 3. the choicest or most essential or most vital part of some idea or experience.
n. 1. a small lump or protuberance 2. a small piece 3. the choicest or most essential or most vital part of some idea or experience. 
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1. That, I think, is the nub of the problem.
2. The real nub of the matter is money.
3. Here we reach the nub of the argument.
4. She's too selfish to help. That's the nub.
5. The nub of the matter is that business is declining.
6. The nub of the problem is our poor export performance.
7. What do you think is the nub of the problem?
8. Here we come to the nub of it.
9. The baby clutched a nub of carrot.
10. This is the nub of the matter.
11. This, however,(http://sentencedict.com/nub.html) was the nub of the problem.
12. Interpersonal skills form the nub of the trainers' course.
13. And that's the nub of it.
14. If the nub of the nation lies in collective sentiment the obvious question is how does this collective consciousness arise?
15. The nub thereof is, of course, that you must first get to know your heron.
16. The nub of the technical job to be done was the control of land use.
17. That's the nub of it.
18. The spokes of the wheel diverge from the nub.
19. The the strain relief nub hangs away from the ear either way and is anchored pretty well from the inside.
20. The nub of it is the difficult, often dysfunctional, relationship between baker, pastry chef and chef.
21. Rubber drainage tube was placed through appendiceal nub and ileocolic part into the proximal end of the intestinal inosculation in order to low the pressure inside.
22. Speed is of no consequence, but duration is vital,(sentencedict.com) the very nub of the matter.
23. Then the Sheikha took her needle and drove it up through the middle of the quarter-inch nub, anchoring the fabric.
24. It sounds perfectly reasonable, but you will perceive that here is the nub of the matter.
25. Even so, some brain cells were still working, as I stared inwardly at the nub of the problem.
26. I was just waiting for the discussion to get down to the real nub of things.
27. All I had to do was file out the small nub that stops the pipes from entering too far.
28. The worst thing about the wireless mouse has got to be that damn dongle—this tiny little nub hogs up one of the few USB ports on my PC.
29. She respected Andrew's wisdom, his knack of going directly to the nub of any situation.
30. Firstly, the thesis designed the system project, aerodynamic configuration, nub and actuator driving device; selected actuator, decelerator, feedback system and central controller.