grunt [grʌnt]

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vt.嘟哝；作呼噜声；vi.作呼噜声；发哼声；n.呼噜声，嘟哝

(of a pig ) to make a low rough noise

He lifted the heavy suitcase with a grunt. 他咕噜着把沉重的提箱拎了起来。
I asked him what he thought, but he just grunted. 我问他在想什么，他只哼了一声。