Icelandic

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A jumping pillow

Etymology

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From ærsl +‎ belgur.

The second sense is a somewhat humorous reinterpretation of the first sense, meaning "a large bag for romping around".

Noun

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ærslabelgur m

  1. a child who is very playful and full of energy
  2. a jumping pillow, a bouncy pillow (a large inflatable piece of playground equipment on which children jump)