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Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.
The Irish border remained open, but that meant that to enforce differing customs rules, goods had to be checked when they crossed between Northern Ireland and the rest of the United Kingdom.
Source: https://www.nytimes.com/2023/03/04/world/europe/uk-eu-northern-ireland.html