noun
a nautical maneuver in which a vessel alternately backs and fills its sails in order to maneuver in a confined space
verb
to maneuver a vessel by alternately backing and filling its sails
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The company had to constantly back and fill in order to comply with the changing regulations.
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I had to back and fill with my schedule to make time for the unexpected meeting.
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She's always back and filling when it comes to making plans.
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His speech was full of back and fill, never getting to the main point.