A common sight; something so common that nobody finds it surprising.
司空古代官名。指某事常见，不足为奇。
唐·孟棨《本事诗·情感》载刘禹锡诗司空见惯浑闲事，断尽江南刺史肠。”
In big cities, seeing people glued to their phones is 司空见惯.
Learn the next connected idiom: 司空见惯 (sī kōng jiàn guàn) → 冠冕堂皇 (guān miǎn táng huáng)
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