A weak link refers to the weak point or person in a system or organisation.
The weakest part of a system or the weakest member of a group of people that could cause the whole system or group to fail.
The least dependable member of a group.
1. The designers on our team carry our high quality work, although Gary might be our weak link.
2. The most recent terrorist attacks proved that the country’s secret services were the weakest link in counter-terrorism defences.
3. Can you tell me about this machine and what part of it would be a weak link?
4. We’ve been unable to provide international shipping orders for our products and it’s a weak link at this point.
damaging weakness, defect, failing, fatal flaw, frailty, shortcoming, soft spot, susceptibility, tender spot, underbelly, vulnerable point, weak point, weak side, weakness