C1 [ before noun ] used to emphasize how very great, important, or powerful a quality or feeling is; nothing except完全的,彻底的
More examples
It was sheer chance that we met.
I've got where I am through sheer hard work.
My time in prison was sheer hell.
Words could not convey the sheer terror of the experience.
People danced in the streets out of sheer joy.
C2 extremely steep; almost vertical陡峭的;近乎垂直的
Sheer clothing or material is so thin, light, and delicate that you can see through it.(织物等)极薄的,透明的
to change direction suddenly突然变向
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