(Caught in the undertow, just caught in the undertow)
Caught in the undertow is a concept well known to swimmers out there that feel that there are “rip currents” – water waves against them. This is how those who do know how to swim, drown. They are unable to find balance as they are tangled between vicious water waves.
In this song, Linkin Park states that every step turns out to be a mistake, a concept similar to being “caught in the undertow.” No matter how many steps they take, they will be in one place, stuck, trying to escape, but not being able to. It could also be that the person they are singing is their undertow.
Perhaps Linkin Park should refer to the image below for assistance:
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