hem and haw

hem and haw  {v. phr.}

1. To pause or hesitate while speaking, often with little throat noises.

The man was a poor lecturer because he hemmed and hawed too much.

2. To avoid giving a clear answer; be evasive in speech.

The principal asked Bob why he was late to school, and Bob only hemmed and hawed.

Compare: BEAT AROUND THE BUSH.