verb (used without object) Horology.
to have the balance staff oscillate so greatly that the fork of the lever fails to engage, rendering the escapement inoperative.

1880–85; over- + bank1

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Example sentences
Larger shrubs are found from the bank zone to the overbank zone and beyond.
The overbank flow path coverage was used to determine the downstream reach
  lengths for the left and right overbanks.
Major overbank flooding is expected along the creek.
Overbank flow calibration requires knowledge of the area of inundation for a
  given hydrograph.
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