the world > space > extension in space > measurable spatial extent > vertical extent > extension downwards or depth > [adjective] > coming from a depth (4)
Of a sigh, sob, etc.: originating in or coming from a great depth; made with a deep breath (chiefly with the implication of deeply-felt emotion…
Fetched from deep in the bosom, or from far below the surface of things; far-fetched.
Drawn deeply or from the depths (esp. of the breast).