The seriousness of his opening statement 'set the tone' for/of the meeting. [=his opening statement established that the meeting would be serious]
('Brit') I keep getting the 'engaged tone'. [=('US') 'busy signal'; the sound which indicates that the telephone line is already being used]
People will be more likely to listen to you if you 'tone down' your language a little.
(..) ...and Pamela probably told Elaine. So, what are you, afraid of her? Yes. Yes, I am. - What else did she say on the phone? - Whatever I wrote down. Yeah, but what was the tone in her voice? How did she sound? Who am I, Rich Little? Well, she can't be too mad. - She's still coming to the wedding. (..)1990 TvShow: Seinfeld Title: The Stakeout Season: 1 Episode 2