Wiktionary
piping down
vb. (present participle of pipe down English)
Usage examples of "piping down".
She laid the piping down by a wall of the central area, got her Tinokti street clothes out of the Fossily tool bag, changed to them, and sat down with her back to the wall.
As Don Miguel had said, the wind was piping down, but its velocity was still too great to warrant a descent.