let us say...
Used to introduce a suggestion, example, estimation, or speculation. I'd sell you the car for, let's say, $2,000. Let's say I agree to give you the loan—what assurances do I have that I'll get my money back in full?
See also: say
let us say...used when making a suggestion or giving an example: I can let you have it for, well let’s say £100.
See also: let