Speak up
To speak in a loud or clear voice, to speak without fear or hesitation.I asked our teacher to speak up because I could not hear him.
Speak the same language (as someone)
To have similar ideas or tastes or opinions as someone else.I think that I speak the same language as the new supervisor in our company.
Speak out of turn
To say something unwise, to say something at the wrong time.The young man spoke out of turn while the teacher was asking him questions.
Speak out about (something)
To speak in favor of or in support of something, to talk freely and without fear about something.My boss spoke out about the lack of computers.
Speak one`s piece
To say openly what one thinks.The man spoke his piece and then sat down.
Speak one`s mind
To say openly what one thinks.I think that it is time for me to speak my mind and talk about my complaints about our company.
Speak ill of (someone)
To say something bad about someone.I wish that my friend would not speak ill of the other people in our class.
Speak highly of (someone or something)
To say good things about someone or something.Everybody speaks highly of the new principal of our school.
Speak for (something)
To make a request for something, to ask for something.I spoke for the comfortable chair as soon as I entered the room.
Speak for itself/themselves
To not need explaining.The actions of the men speak for themselves and there is no point talking about it.