Definitions

1. verb

to remove or destroy a dike or barrier; to unblock a stream or river

“The floodwaters had undiked the nearby village, causing widespread damage.”

2. verb (archaic)

to make a dike or barrier, especially for a river or stream

“In the 18th century, the villagers undiked the river to create a new farmland.”

3. noun

a place where a dike or barrier has been removed, especially for a river or stream

“The undiked area of the river was prone to flooding during heavy rainfall.”