My days
yowm (yome)
a day (as the warm hours),
are like a shadow
tsel (tsale)
shade, whether literal or figurative -- defence, shade(-ow).
that declineth
natah (naw-taw')
to stretch or spread out; by implication, to bend away (including moral deflection); used in a great variety of application (out), stretch (forth, out), take (aside), turn (aside, away), wrest, cause to yield.
and I am withered
yabesh (yaw-bashe')
to be ashamed, confused or disappointed; also (as failing) to dry up (as water) or wither (as herbage)
like grass
`eseb (eh'seb)
grass (or any tender shoot) -- grass, herb.
