名詞 knife:

1. edge tool used as a cutting instrument; has a pointed blade with a sharp edge and a handle
2. a weapon with a handle and blade with a sharp point
3. any long thin projection that is transient
   同義詞：tongue

動詞 knife:

1. use a knife on
   同義詞：stab

1. He whetted his knife on the stone.
   他在石頭上磨刀。
2. He cleaved an apple with a knife.
   他用一把刀子將蘋果切開。
3. I couldn't withstand a murderous-looking knife.
   我無法忍受兇光閃閃的刀。
4. His strong voice cut through the hum of conversation like a knife through butter.
   他那宏亮有力的聲音一下子壓倒了嗡嗡的談話聲。
5. I picked up the knife and threw it out of the window.
   我拿起了那把刀，把它扔到了窗外。

knife

n.（名詞）
【復數】 knives[novz]
A cutting instrument consisting of a sharp blade attached to a handle.
有柄的小刀：由一個附在柄上的鋒利刀片構成的切割工具
A cutting edge; a blade.
刀刃；刀鋒
v.（動詞）
knifed,knif.ing,knifes
v.tr.（及物動詞）
To use a knife on, especially to stab; wound with a knife.
用刀切割，用刀割傷：用刀，尤指刺傷；用刀弄傷
Informal To betray or attempt to defeat by underhand means.
【非正式用語】 背叛，陷害：用不光彩的手段出賣或試圖戰(zhàn)勝
v.intr.（不及物動詞）
To cut or slash a way through something with or as if with a knife:
切割，劃過：用刀或好象用刀割或割開一道：
例句：
The boat knifed through the waves.
船只破浪前進

<習慣用語>under the knife【非正式用語】
Undergoing surgery.
進行外科手術
來源：
Middle English knif
中古英語 knif
from Old English cnof
源自 古英語 cnof
from Old Norse knofr
源自 古斯堪的納維亞語 knofr

【引伸】
knif.er
n.（名詞）