hired. hired [lovers].
gather. gather [against].
them: i.e. the nations (Israel's lovers).
sorrow. be in woe.
a little. in. little time, speedily; as in Haggai 2:6. The Hebrew accents indicate that we should render "and, ere long, they will be writhing under the burden": king [will be writhing], princes [will be writhing].
the burden of the: i.e. the tribute [laid on them].
king of princes. king and princes. Compare Isaiah 10:8; Isaiah 10:11
made many. multiplied. Compare Hosea 12:10.
be unto him. have become to him.
sin. The same word, but here put by Figure of speech Metonymy (of Effect), App-6, for the judgments caused by the sin.