rock steady (alsorock-steady)

• 1.  

  ADJ（形容词） Something that is rock steady is very firm and does not shake or move about. 非常稳固的; 一动不动的

  例：

  He reached for a cigarette and lit it, fingers rock steady.

  他伸手拿了一支烟点着，手指纹丝不动。