a car and driver that you pay to take you somewhere [= cab]
take/get a taxi
I took a taxi to the airport.
in a taxi
They had to send me home in a taxi.
She arrived by taxi.
It's only a 5 minute taxi ride away.
Shall I call you a taxi (=telephone for a taxi to come)?
hail a taxi (=wave or shout at a taxi to make it stop)