Present participle of 'funnel,' meaning to pour through a funnel or to direct things through a narrow, concentrated path.
From the verb 'funnel' plus the -ing gerund ending, allowing the action to be discussed as an ongoing activity or concept.
The verb 'funnel' shows how English frequently converts nouns into verbs—if something has a shape, we can use that shape-noun as a verb to describe what that shape does!
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