How to Say "they uphold" in Spanish
The Spanish word for “they uphold” is “mantienen” — B2 level.
English → SpanishB2
VerbB2formal
a principle or law

Examples
Los jueces mantienen la decisión del tribunal anterior.
The judges uphold the previous court's decision.
Ellos mantienen que la reforma es necesaria.
They maintain (or assert) that the reform is necessary.
Las empresas mantienen sus principios éticos.
The companies uphold their ethical principles.
Verbs of Assertion
When 'mantienen' means 'they assert' or 'they claim,' it is usually followed by 'que' and then the statement they are asserting. This usage is common in news reporting or formal debates.
Related Translations
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