Where does “絨毯爆撃” come from?

絨毯爆撃 (Japanese) comes from Japanese 爆撃 — bombing, bombardment; bomb.

絨毯爆撃 (Japanese): carpet bombing

Definitions

Step	Language	Word	Meaning
1	Japanese	爆撃	bombing, bombardment; bomb

絨毯爆撃 — Etymology, Origin & Word History | Etymology Explorer