Wiktionary
hum and haw
alt. (context British idiomatic English) Procrastinate and take a long time before doing something or taking a decision. vb. (context British idiomatic English) Procrastinate and take a long time before doing something or taking a decision.
Usage examples of "hum and haw".
At these times his thermometer would be placed under her armpit and he would hum and haw about the relative inefficiency of the method.