# Howl in lament

"Cry loudly and weep"

# Heshbon

"people of Heshbon". Translate the name of this city as done in Jeremiah 48:2.

# for Ai will be devastated

"for your enemies will devastate Ai"

# daughters of Rabbah

"women of Rabbah" or "people of Rabbah"

# Gird yourselves with sackcloth

"Put on the clothes that show you are mourning". They are to prepare to mourn, not to work or fight. See Jeremiah 4:8. 

# for Molech is going into captivity

"for your enemies will take your god Molech captive." This means the enemies will take the idol, Molech, back to their land.