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vassalize

British  
/ ˈvæsəˌlaɪz /

verb

  1. (tr) to make a vassal of

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

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This alliance, though the exact terms were not known to Cromwell—“the attempt to vassalize us to a foreign nation,” to use his own words—convinced him of the uselessness of any plan for maintaining Charles on the throne; though he still appears to have clung to monarchy, proposing in January 1648 the transference of the crown to the prince of Wales.

From Project Gutenberg

The last intrigue with the Scots was the most unpardonable in the eyes of his contemporaries, no less wicked and monstrous than his design to conquer England by the Irish soldiers; “a more prodigious treason,” said Cromwell, “than any that had been perfected before; because the former quarrel was that Englishmen might rule over one another; this to vassalize us to a foreign nation.”

From Project Gutenberg