2 Metaphors for subsidences

And, as in the sea, there are no furrows absolutely isolated from each other, but each leans on, or melts into each, and the subsidence of the one is the rise of the otherso with the versification of his better poetry.

At each pause my heart throbbed audibly, as I leaned upon my staff, and the subsidence of this action was always the signal for further advance.

2 Metaphors for  subsidences