| Idiom | Meaning | Example | 
| firm market | 
strong market, seller's market
 | 
A firm market in the automotive industry is good
for the American economy.
 | 
| first and foremost | 
first and most important, firstly
 | 
The speaker began by saying, "First and foremost... ."
 | 
| first class | 
high quality, excellent
 | 
Pam's meals are first class. She's an excellent cook.
 | 
| first come, first served | 
whoever comes first gets served first
 | 
If tickets are selling on a first-come basis, let's buy ours now.
 | 
| first crack at | 
first turn, first chance to do it
 | 
I want first crack at solving the problem. I want to try first.
 | 
| first dibs | 
first person to use it, first chance to use it
 | 
When we get to the motel, I get first dibs on the shower.
 | 
| first down/first and ten | 
first try to gain ten yards (in football)
 | 
The Lions have a first down on their own 35-yard line.
 | 
| first hand | 
being there to see or hear it, in person
 | 
I want to see the Pantheon first hand. I want to see its dome.
 | 
| first light | 
(See at first light)
 | 
 | 
| first off | 
first on the list, the first thing to do
 | 
First off, we should define the problem. Then we can solve it.
 |