To identify or understand something exactly.
Let's nail down some possible meeting times for the conference that are good for everyone.
What you can see without assistance (binoculars, telescopes...)
Some planets are visible from Earth with the naked eye.
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!
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.