Sticking two things together using adhesive substance, or figuratively, being completely focused or fascinated by something.
From 'glue,' which comes from Old French 'glu,' from Latin 'glus.' The gerund form '-ing' makes it a present participle or noun.
Modern adhesives are chemistry marvels—superglue (cyanoacrylate) was discovered by accident in the 1940s when scientists were trying to make clear plastic for gun sights. Now NASA glues spacecraft together with adhesives stronger than welding!
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