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  1. The sloping margin of a stream or river that confines flow to the natural channel during normal stages.

    The top of this channel margin may be exceeded during overbank flood flows.

  2. A steep slope or face, usually developed in unconsolidated material such as sand or gravel.

  3. A shallow area in the sea or other water body, consisting of shifting sediment, and designated by a qualifying word, such as "gravel bank."

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