What does ダンッ mean in the following sentence from my book?
「ダンッ」 is an onomatopoeia (or sound effect) of bumping into something.. like "bump", "thud", "thump", similar to 「ドン」、「ドンッ」、「ドシン」...
Is this sentence from a textbook or storybook? It could possibly be the name of someone. Are you sure it's a small ツ?