Shadow when it declineth. — Literally, a lengthened shade. (Comp. Psalms 102:11, and see Note. Song of Solomon 2:17.) When the day declines the shadow lengthens, it becomes longer and longer, till it vanishes in the universal darkness. Thus does the life of the suffering generation pass away.
Tossed up and down. — Better, tossed or shaken out, as from the lap. So LXX. and Vulg. (See Nehemiah 5:13, where the same verb is three times used.) The grasshopper was an emblem of timidity (Job 39:20).