词典释义：
a cutting instrument composed of a blade and a handle into which it is fixed, either rigidly or with a joint
刀，小刀。
an instrument such as this used as a weapon
匕首；刺刀。
a cutting blade forming part of a machine
（机器上的）刀片；（切削）刀具。
stab (someone) with a knife
用刀刺（人）。
[no obj., with adverbial]cut like a knife
（像刀一样）切割
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a shard of steel knifed through the mainsail .一块钢片割开了大桅帆。
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before you can say knife informal very quickly; almost instantaneously 〈非正式〉 极快地，一瞬间 -
（that） one could cut with a knife （of an accent or atmosphere） very obvious（口音，气氛）浓重的，非常明显的 -
ge t （或stick ）the knife into （或in ）someone informal do something hostile or aggressive to someone 〈非正式〉 做敌视某人的事；威胁某人 -
go （或be ）under the knife informal have surgery 〈非正式〉 经受外科手术 -
the knives are out for someone informal there is open hostility （towards someone） 〈非正式〉 （对某人）剑拔弩张 -
like a hot knife through butter very easily; without any resistance or difficulty 轻而易举；势如破竹anti-aircraft fire would slice through the car like a hot knife through butter . 防空火力将轻而易举地把汽车打成碎片 -
twist （或turn ）the knife in the wound deliberately make someone's sufferings worse 故意让人更加痛苦，给伤口上抹盐
"late Old English
