Commentaries:
Jamieson, Fausset, and Brown
Aven—that is, Beth-aven. 
 the sin—that is, the occasion of sin (Deuteronomy 9:21; I Kings 12:30). 
 they shall say to . . . mountains, Cover us—So terrible shall be the calamity, that men shall prefer death to life (Luke 23:30; Revelation 6:16; Revelation 9:6). Those very hills on which were their idolatrous altars (one source of their confidence, as their "king," Hosea 10:7, was the other), so far from helping them, shall be called on by them to overwhelm them.
Other Jamieson, Fausset, and Brown entries containing Hosea 10:8:
1 Kings 3:3
1 Kings 12:26-32
Isaiah 27:9
Hosea 10:1
Amos 5:5
Luke 23:30
Revelation 6:16
 
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