Definitions

1. noun

a flood that occurs when a river or stream is blocked by an ice jam or other obstruction, and the water rises to a higher level behind the blockage.

“The underflood caused significant damage to the surrounding area, prompting emergency responders to evacuate residents.”

2. verb

to cause a flood by blocking a river or stream with ice or another obstruction.

“The winter storm caused the river to underflood, putting nearby homes and businesses at risk of flooding.”