What is "tongas"

Usage examples of "tongas".

It issued from the rumps of the horses between the shafts of the city's many tongas, ikkas and gharries.

There was still trade for the horse‑drawn tongas, but it was dwindling… Nadir Khan ducked in through the gate, squatted for a moment with his back to the perimeter wall, reddening as he passed his water.

He sailed a schooner for copra in the Tongas and went silver prospecting on big Apia in the Solomon Islands.