to hum and haw(Britain); to hem and haw(US)
吞吞吐吐不敢直说
mutter and mumble, not daring to speak out
吞吞吐吐地回答说
mumble a reply
干吗吞吞吐吐？直截了当说吧！
Why are you humming and hawing? Get to the point!
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