Here are the dictionary meanings of the word पुनर्भू (punarbhū):
mfn. being renewed, restored to life or youth RV. AV.
f. a virgin widow re-married AV. &c
f. re-existence W.
I'm interested in the second meaning of the word sourced from Atharvaveda. In what context was it used in AV?
Are there any examples of widow remarriages (virgin or not) in Hindu scriptures?