What does "bean" mean?

See bean in WNW Idioms

full of beans

Slang
  1. full of energy and vitality; lively
  2. ☆ mistaken; in error

spill the beans

☆
Informal to divulge secret information

See bean in American Heritage Dictionary 4 Idioms

full of beans

  1. Energetic; frisky: The children were too full of beans to sit still.
  2. Badly mistaken: Don't believe him; he's full of beans.

spill the beans

To disclose a secret.

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