Lay siege to: Put in a very difficult situation.
Taken from the late 16th century Dutch belegeren meaning to camp round, which was created from be- (all) about + leger a camp..
“Seize them, beleaguer them, and lie in wait for them.”
“The more beleaguered he feels, the more he will dig in his heels.”
The last stage of life; old age.
Senectitude comes from the Medieval Latin noun senectitūdō meaning “old age,” which in turn comes from Classical Latin senectūs, a derivative of the noun senex meaning “old man.” Senectitude entered English in the late 1700s, more precisely, in 1796 in Jonathan Swift’s Gulliver’s Travels