hack up +
猛烈地咳嗽而把喉嚨或肺部裡的痰等物咳出來
We frequently hacked up a lot of phlegm while we were ill. (我們生病時往往會咳出許多痰)
The cat was hacking up a hairball. (那隻貓咳出一團毛球)
hack * up +
(用刀或其他尖銳工具將某物) 砍、劈或剁成碎片、碎塊
He hacked the table up and burnt it. (他把桌子劈成碎片後將它燒掉)
The killer had hacked up the body. (兇手將屍體剁成碎塊)
head * off +
防止，阻止 (不好的情況發生)
The company is giving employees large raises to head off a strike. (公司將給員工大幅加薪以防罷工)
head * off +
迫使…改變方向
The father tried to head the dog off by running towards it. (這位父親朝著狗跑去，試圖把牠趕走)
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