Weakens, as the tide (4)
I believe the answer is:
ebbs
(Other definitions for ebbs that I've seen before include "Flows back - declines" , "Declines gradually" , "Wanes" , "Flows back or recedes" , "fades away" .)
I believe the answer is:
ebbs
(Other definitions for ebbs that I've seen before include "Flows back - declines" , "Declines gradually" , "Wanes" , "Flows back or recedes" , "fades away" .)