# Like sheep

The writer compares people who will all die to a flock of sheep. Just as sheep cannot escape when the butcher decides to slaughter them, so men will not escape when it is their time to die. 

# they are appointed

"God has appointed them" 

# death will be their shepherd

"death will take them away as a shepherd leads away sheep to be slaughtered" 

# in the morning

Here the word "morning" is a metaphor that refers to a time when God will vindicate righteous people and save them from evil people.

# their bodies will be consumed in Sheol

"their bodies will decompose in the grave"