A berry or fruit that drops easily from its plant, or a specific type of berry known for falling readily when ripe.
Compound word from 'drop' plus 'berry'. Descriptive compounds like this are very old in English—naming things by their characteristics is a natural word-formation process.
Some berries actually evolved to drop easily when ripe because it helps with seed dispersal—animals pick them up off the ground, and nature gets free transportation for the seeds!
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