司空见惯 sīkōng-jiànguàn a common occurrence (idiom)
How to remember 司空见惯: 司 department + 空 empty + 见 see + 惯 habit = a common occurrence (idiom).
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How it is used
- An idiom: 'a common sight, so ordinary as to attract no notice' - 这种现象早已司空见惯 (this phenomenon has long been commonplace).
- From a Tang story about an official (司空) unimpressed by a scene he'd seen countless times; used to say something is nothing unusual.