1. present participle of shallow#English|shallow

shallowing (plural shallowings)

  1. The act of becoming shallower.
    • 1907, Scottish Geographical Magazine (volume 23, page 349)
      The main 200-feet basin is about 8 miles long; it includes three areas of over 300 feet, which, however, are only separated by very slight shallowings.

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