scud
verb [ I usually + adv/prep ] uk/skʌd/ us/skʌd/ -dd-
（尤指云彩和船只）飞奔，疾行，掠过
(especially of clouds and ships) to move quickly and without stopping in a straight line
It was a windy day, and small white clouds were scudding across the blue sky. 那天有风，朵朵白云在蓝天上随风掠过。