To make guttural in quality; to pronounce or articulate as a guttural sound, primarily British English spelling.
From 'guttural' + the verb-forming suffix '-ise' (British spelling of '-ize'). This creates a verb meaning to transform into a guttural sound.
A singer might 'gutturalise' certain notes by using deeper throat resonance—it's a technique in certain singing styles and languages, where throat position fundamentally changes how sound emerges.
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