Может, кто-то в теме. Что на языке юристов/судов означает (jurisdictional) gateway или просто  gateway ?

Например, здесь: There is a good arguable case that the claim falls within one or more of certain defined jurisdictional “gateways”. There are a number of jurisdictional gateways including (among others) whether the claim is made in respect of a contract that contains an English jurisdiction clause, whether the relevant contract is governed by English law and whether the overseas defendant is a necessary or proper party to the claim being made in England. Claimants wishing to sue foreign defendants must show that they have a good arguable case that one or more of the jurisdictional gateways has been satisfied.

Заранее благодарю за подсказки.

(просто чтоб начать дискурс...)

+ ещё "лазейки/прогалины"

пожалуйста, приводите логически цельный фрагмент текста или давайте ссылку - тем более, что в данном случае она имеется: https://www.lewissilkin.com/Insights/English-courts-and-overseas-defendants-jurisdiction-challenges-and-the-two-fold-test

There are three requirements that a claimant must satisfy in order to obtain permission to serve English proceedings on a foreign defendant outside the jurisdiction, namely:

1. There is a serious issue to be tried on the merits in relation to the foreign defendant - this means that there has to be a real, as opposed to fanciful, prospect of success on the claim.

2. There is a good arguable case that the claim falls within one or more of certain defined jurisdictional “gateways”. There are a number of jurisdictional gateways including (among others) whether the claim is made in respect of a contract that contains an English jurisdiction clause, whether the relevant contract is governed by English law and whether the overseas defendant is a necessary or proper party to the claim being made in England. Claimants wishing to sue foreign defendants must show that they have a good arguable case that one or more of the jurisdictional gateways has been satisfied.

3. England is the most appropriate forum in which to hear the claim(s). This will often involve considerations of convenience and expense, the governing law of the dispute and whether the claimant could obtain justice in another jurisdiction.

юридический ≠ юрисдикционный, поэтому лично я не вижу, каким образом этот вариант может быть "более подходящим"

Если серьёзно, то я в такие дебри залезать не готов. Будем считать это вкусовщиной.