Wiktionary
flagging down
vb. (present participle of flag down English)
Usage examples of "flagging down".
Twenty minutes of this found us under the broad eaves of a refrigerated storage facility, where I waved a transport pager at the sky and eventually succeeded in flagging down a cab.
Before he let her get dehydrated he would take the chance of flagging down a car, but it hadn't come to that yet, and he didn't want to take unnecessary chances.
Adam was extremely unhappy at the news that Robin had successfully talked Jules out of flagging down a taxi.
Then I made it to the road, to try flagging down a passing motorist.