(idiomatic) To recite a prayer of invocation or thanksgiving at meal time.

(idiomatic, colloquial) What did you say?; Huh?; expresses incredulity.

(colloquial) I say so; on my authority.

(colloquial) Who says so; on whose authority?

(slang) say what.

(Britain, dated) An exclamation of surprise or protest. / Used for emphasis, or when resuming after diversion or interruption.

(idiomatic, colloquial) Used to indicate emphatic agreement

Alternative form of suffice it to say

An introduction to a statement that will be brief, indicating that further discussion would be futile, too lengthy, too private, etc.

Sadly; unfortunately.