the legal system in England and most of the US that has developed over a period of time from old customs and court decisions, rather than laws made by politicians
common-law
adjectiveuk/ˈkɒm.ən.lɔː/us/ˈkɑː.mən.lɑː/
common-law wife/husband事实婚姻的丈夫（或妻子）
someone who is not officially a wife or husband but is considered to be one because she or he has been living with their partner for a long time