pū is the verb of laying things flat across a surface — bedding, paving, cabling, anything spread out evenly:
铺床 (make the bed),
铺路 (pave a road; also figurative: lay the groundwork),
铺设 (lay pipes / tracks),
铺平 (spread flat). The vivid idiom
铺天盖地 (literally 'spreading the sky, covering the earth') describes anything overwhelmingly all-pervasive.