(literal sense) To wish someone farewell upon their leaving. / (idiomatic) To separate from someone or something.

(idiomatic, colloquial) "What did you say?" or "Repeat what you have said." A polite formula used when one has not heard or understood what has been said.

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

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

(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.

The tone and delivery of communication is at least as important as what is actually being said.