English

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Etymology 1

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From birdnest +‎ -ing (present participle ending).

Verb

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birdnesting

  1. present participle and gerund of birdnest

Etymology 2

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From birdnest +‎ -ing (gerund ending).

Noun

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birdnesting (countable and uncountable, plural birdnestings)

  1. The act or process of collecting bird eggs.