This is the 9326th most frequent Japanese word.
直通
Direct connection or direct service.
In this context, '直通' is used to describe a transportation route that directly connects two locations.
大阪と福岡を直通する新幹線ができました。
A new Shinkansen that has direct service between Osaka and Fukuoka has been introduced.
The word '直通' is used to describe a direct transportation service without transfers.
この電車は東京駅まで直通です。
This train is a direct service to Tokyo Station.
Here, '直通' describes a phone line that connects directly to the intended recipient without intermediaries.