The phrase "deep splits" refers to divisions or disagreements that go beyond surface-level arguments and are serious or significant. It suggests that the differences or conflicts are profound and may be difficult to resolve. Full definition
Shadow Defence Secretary Emily Thornberry - like Mr Corbyn a staunch unilateralist - is leading a review of Labour's policy on Trident, which has already exposed deep splits within the party on the issue. (politicshome.com)
A left - leaning coalition - formal or informal - will have around five parties, with deep splits over single market membership and free movement, and with the SNP existentially needing to portray Westminster (especially a Labour government in Westminster) as being out of touch with Scotland. (politics.co.uk)
Nevertheless, several studies suggest that the human genome records some strikingly deep splits between populations. (scientificamerican.com)