Vocabulary

ਬਚਾਈਆਂ
bachaiyaan

protected, saved, kept safe (from bachaana = to save/protect; here: she kept her eyes free from dark circles for 21 years)

verb
In this song
Akhiyan · Harkirat Sangha
Verse 3
ਮੈਂ 21ਆਂ ਸਾਲਾਂ ਤੀਕ ਬਚਾਈਆਂ
main 21'ian saalan teek bachaiyaan
I kept these eyes dark-circle-free for 21 years