floating bridge

noun

1

: a temporary bridge supported by low flat-bottomed boats or pontoons

2

: a double bridge that has the upper level projecting beyond the lower and capable of being moved forward by pulleys and was used formerly for carrying troops over narrow moats in attacking the outworks of a fort

3

: a ferryboat drawn and guided by chains that are anchored on the sides of a stream and that mesh with wheels on the boat

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