push (one) over the edge

push (one) over the edge

1. To cause one to commit to doing something they had been considering or close to doing for a long time. I tried to remain silent about my father's associations with the extremist group, but the events over the weekend have pushed me over the edge.2. To cause one to suffer a mental breakdown. Following on the heels of her recent divorce, the death of her father pushed Kate over the edge.See also: edge, over, push