Lift up ... eyes - Jerusalem is addressed as a female with eyes cast down from grief.
all they ... they - The Gentile peoples come together to bring back the dispersed Hebrews, restore their city, and worship Jehovah with offerings.
nursed at thy side - rather “carried at thy side.” It is the custom in the East to carry the children astride on the hip, with the arms around the body (Isa 66:12).