speak for phrasal verb ( see also ↑ speak )
1 . speak for somebody/something to express the feelings, thoughts, or beliefs of a person or group of people:
Dan, speaking for the students, started the meeting.
2 . speak for yourself spoken used to tell someone that you do not have the same opinion as they do, or that something that is true for them is not true for you:
‘We don’t want to go.’ ‘Speak for yourself!’
3 . be spoken for if something or someone is spoken for, they have already been promised to someone else:
They’re all either married or spoken for.
4 . speak for itself/themselves to show something very clearly:
The results speak for themselves.