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.
(..) like that! What's the matter?! Does that make you angry? Yes, it makes me angry! It didn't help That you used that tone of voice the minute he came in the door. Well, he's drivin' me crazy! You know why you're really angry? (..)1993 Free Willy