don't say (informal)

Surely it's not, let's hope it's not, the case that (eg don't say I've no money with me!)

I'll say! (informal)

A response expressing wholehearted agreement

I say!

An exclamation calling attention or expressing surprise, protest, sudden joy, etc

it goes without saying

It is obvious

it is said or they say

It is commonly reputed

it says (that) (informal)

The text runs thus

nothing to say for oneself

1. No defence of oneself to offer
2. No small talk

nothing to say to

No dealings or conversation with

not to say

Indeed one might go further and say

says I, says you, he, etc (in non-standard or joc use)

Ungrammatical substitutes for said I, you, he, etc

says you

An interjection expressing incredulity

that is to say

In other words

there's no saying

It is impossible to guess or judge

to say nothing of

Not to mention

to say the least

1. At least
2. Without exaggeration

what do you say to?

1. How about?
2. Are you inclined towards?

you can say that again (informal)

You are absolutely right, I agree entirely

you don't say! (informal)

An astonished rejoinder, or ironic response to the obvious or unamusing