godan verb (-ru)
grope around; fumble around
Physically searching with one's hands in the dark or in an unseen space, often with a sense of uncertainty.
暗闇の中で探り回ってスイッチを探した。
I groped around in the dark looking for the switch.
彼は机の下を探り回って落
He fumbled under the desk looking for the pen he dropped.