Nail down:
To identify or understand something exactly.
Let's nail down some possible meeting times for the conference that are good for everyone.
Naked eye:
What you can see without assistance (binoculars, telescopes...)
Some planets are visible from Earth with the naked eye.
Name of the game:
The main point of something.
When you're an advertiser, getting people's attention is the name of the game.
New Kid on the Block:
A person new to the area or group of friends.
I guess I’m the new kid on the block, right?
New York Minute:
Time that seems to pass really quickly.
That movie went by in a New York minute!
No Dice:
To reject something or to disagree.
No dice. I’m not giving you the front seat of the car. I’m riding up front!
None the wiser:
To not know something even though you should.
Despite the fact that he explained how to get to calculate the area of a circle three times, I was none the wiser.