verb (used with object), radicalized, radicalizing.
to make radical or more radical, especially in politics.
verb (used without object), radicalized, radicalizing.
to become radical or more radical, especially in politics.
Also, especially British, radicalise.

1815–20; radical + -ize

radicalization, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To radicalize
World English Dictionary
radicalize or radicalise (ˈrædɪkəˌlaɪz)
to make (a person) more radical
radicalise or radicalise
radicali'zation or radicalise
radicali'sation or radicalise

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Nothing would radicalize regional sentiment, now focused on building rather
  than destroying, as quickly.
Especially if it is a bad government, it will be seen as our puppet and further
  radicalize people in the region against us.
We also radicalize those who resented our support for past regimes.
Though unsuccessful, these attempts represent genuine efforts to radicalize the
  colonial curriculum.
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