Hollow knight orange goo. 2. English dictionary and integrated thesaurus for learners, writers, teachers, and students with advanced, intermediate, and beginner levels. See examples of hollow used in a sentence. He heard a hollow sound when he knocked on the wall. in a hollow manner: The politician's accusations rang hollow. Jan 28, 2026 ยท (of a sound) Distant, eerie; echoing, reverberating, as if in a hollow space; dull, muffled; often low-pitched. Idioms beat all hollow, to surpass or outdo completely: His performance beat the others all hollow. 1. If something is hollow, it is empty on the inside. A chocolate Easter bunny looks like so much chocolate until you realize that it is hollow and quickly eaten.
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