hum and haw
To speak in an evasive, vague, roundabout way in order to avoid responding to a question or making a definite statement. The phrase comes from the common filler words often used by habit or when one is deciding what to say. Primarily heard in UK. How much longer do we have to hear this guy hum and haw? I wish they would get on with the debate.
hum and haw (or ha)
hesitate; be indecisive. British The word hum has been used as an inarticulate syllable in hesitant speech since Chaucer; ha appears in a similar role from the early 17th century.