"Each unit attacking a feeble unit will deal excess damage to the tower instead. For example, if Debbi (4/3) is blocked by a unit (1/3), and uses "No Accident" leaving it with 1 remaining health, 3 damage will be dealt to the tower and her passive ability will trigger."
- Valve Blogpost
Feeble is a keyword in Artifact 2.0.
When a unit with Feeble dies, any excess damage (overkill damage) would be dealt to the tower of said unit.
Cards with Feeble