run away with someone—
1. (of lovers, etc.) elope with a person:
- Well, ma’am, in round numbers, she’s run away with the soldiers.
2. go out of smb.’s control; become ungovernable:
- If corporations are not to run away with us, they must become quasi-governmental institutions.
run off with someone—
1. = run away with someone 1:
- Lew Archer’s job is to find a 17-year-old girl who has run off with a 19-year-old no-goodnik.
2. capture and abduct a person:
- “C’mon, sweetheart,” the man with the gun said to Molly, grabbing her by the hand. Everyone watched helplessly as the three men ran off with Molly.