NUMBERS  expressions

0

ground zero
a zero-sum game

1

there's more than one way to skin a cat

looking out for number 1

a one-horse town

a one-hit wonder

back to square one

one night stand

a one-way 

snake eyes 

first impression

first come first served

do a number 1 

on day one (campaign promise)

2

it takes two to tango

kill two birds with one stone

the lesser of two evils

to know a thing or two about something

my two cents

that makes two of us

two wrongs don't make a right

do a number 2 / going number 2

2's company, 3's a crowd

two left feet

to put two and two together

second-hand

secondary

second nature

to give one's two weeks

double-checking  ('double checking, triple checking')

to play doubles

to double one's money, one's chances, etc. 

3
three sheets to the wind

a three alarm fire

3 strikes... (and you're out)

menage a trois

to give someone the third degree (to interrogate them closely)

third rail (e.g. of politics)

to get to third base 

triple-checking

triple-threat

4
On all fours

four eyes

four-leaf clover

a four letter word

'eran 4 gatos' = in spanish, 4 means not many, a pittance

5
Take five / take 10

high five / give me five

the  5 second rule

plead the fifth

'say that 5 times fast'

at the 5 and dime (the dollar store)

6

six feet under

six pack (beer or abs)

six of one and half a dozen of the other

six ways to sunday

checking his sixes (looking left and right)

7
the 7 wonders of the world

seven-year itch

At sixes and sevens 

8

behind the 8-ball

9
On cloud nine

9 to 5 job

the whole 9 yards

9 times out of 10

dressed to the nines

A stitch in time saves nine 

10+

10 and 2. 

take 5.  take 10.  

I wouldn´t touch him with a 10-foot pole.

Perfect ten

At the eleventh-hour

11th hour ______ (meeting) (agreement) etc

what's your 20?  (film term)

hindsight is 20/20

catch-22 (a no win situation)

24-7 /  24-7-365

fifty-fifty

69

to 86 something

100 percent

going at 100 miles an hour

"That´s (Noun) 101"

to do a 180

to go 1 8 7 on someone (cop code)

one´s 401K

batting 1000

Y2K

the chances are a million to one

the chances are one in a million

I feel like a million bucks