drawbridge

In olden times, if you lived in a castle, you might have a drawbridge that could be raised and lowered depending on whether or not you wanted to let people cross your moat.

A drawbridge gets its name from the fact that it could be "drawn up," or raised, to keep intruders or unwanted visitors away from a tower or castle. The typical medieval drawbridge spanned a deep, wide moat (a trench filled with water). This moveable wooden bridge was usually attached to a guarded gatehouse and could be raised and lowered fairly easily with ropes or chains.

Definitions of drawbridge
1

n a bridge that can be raised to block passage or to allow boats or ships to pass beneath it

Synonyms:
lift bridge
Type of:
bridge, span
a structure that allows people or vehicles to cross an obstacle such as a river or canal or railway etc.

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