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Verb: hum and haw (hummed and hawed,humming and hawing,hums and haws)
  1. Speak hesitantly, indecisively, or evasively; to avoid giving a direct answer or making a firm decision
    "She hummed and hawed when asked about her opinion on the controversial topic";
    - hem and haw

Derived forms: hums and haws

Type of: hesitate, pause