Where does “trước sau” come from?

trước sau (Vietnamese) comes from Vietnamese sâu, from Urdu سو, from Sanskrit शत, from Sanskrit वत्सर, from Sanskrit वत्स, from Proto-Indo-Iranian watsás, from Proto-Indo-European wots-ó-s, from Proto-Indo-European wétos — year; year-old.

trước sau (Vietnamese): always; constantly; all along

Definitions

  1. always; constantly; all along

Ancestry of “trước sau”, step by step

trước sau traces back through two separate lines of ancestry.

via Vietnamese sâu

StepLanguageWordMeaning
1Vietnamesesâudeep; deeply; caterpillar
2Urduسوhundred
3Sanskritशतhundred, used with numerals thus; any very large...
4Sanskritवत्सरyear
5Sanskritवत्सa calf; the young of any animal, offspring,...
6Proto-Indo-Iranianwatsásyearling calf
7Proto-Indo-Europeanwots-ó-s
8Proto-Indo-Europeanwétosyear
9Proto-Indo-Europeanwet-year; year-old

via Vietnamese trước

StepLanguageWordMeaning
1Vietnamesetrướcbefore; in front of; ago
2Proto-Vietick-laːkbefore, in front of
Every word from Proto-Indo-European wet-Every word from Proto-Indo-European wétosEvery word from Proto-Indo-European wots-ó-s