over the barrel
{adv. phr.}, {informal} In the power of your enemies; not able to do anything about what happens to you; in a helpless condition; trapped.
Bill had Tom over a barrel because Tom owed him money.

Ralph has me over a barrel; I need five dollars, and he won't lend it to me unless I let him use my bicycle.
Compare: ON THE ROPES.

[TahlilGaran] English Idioms Dictionary ▲