It has been a long time since something started; existing for a long time.
由来从发生到现在。事情从发生到现在已经过了很长时间了。
南朝·宋·刘义庆《世说新语·德行》王子敬病笃，道家上章应首过，问子敬由来有何异同得失。”
This tradition is long-standing and has been passed down for generations.
Learn the next connected idiom: 由来已久 (yóu lái yǐ jiǔ) → 久而久之 (jiǔ ér jiǔ zhī)
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