Present participle of concretize; the process of making something abstract into something concrete and tangible.
From concretize plus -ing gerund suffix (Old English -ing, denoting continuous action). The form describes the ongoing process of converting abstractions into reality.
The most powerful moment in learning is when a teacher is concretizing an idea—you can actually see the lightbulb moment when students realize 'oh, THIS is what that abstract thing actually means in real life.'
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