'Declines' in the Bible

My days are like an evening shadow that lengthens and vanishes [with the sun];And as for me, I wither away like grass.

I am vanishing like a shadow when it lengthens and fades;I am shaken off like the locust.

“[They shout], ‘Prepare for war against her;Arise, let us [take her by surprise and] attack her at noon.But alas, the daylight pales,The evening shadows grow long.