IPA: /ˈtoʊlɡeɪt/
KK: /ˈtoʊlɡeɪt/
A place on a road where drivers must stop to pay a fee to use the road, tunnel, or bridge.
We stopped at the tollgate to pay for using the highway.
Tollgate is formed from "toll" (from Old English *toll*, meaning a payment or charge) and "gate" (from Old English *geat*, meaning an opening or entrance). The word "tollgate" refers to a gate where a payment is collected for passage.
Think of a 'payment' ('toll') that you must make at an 'entrance' ('gate') to pass through — that's what a tollgate is.