How might a heavy undertow affect the formation of breakers above it?

Undertow refers to a current of water below the surface and moving in a varying direction from any surface current. The formation of breakers takes place as the waves come in contact with the floor of the ocean. The undertows are moving out to sea along the floor of the ocean.  

Thus, undertows must have taken part in slowing down the incoming ways and the origination of water molecules, which makes the waves to increase in height.  

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