tip sb.over the edge

tip over the edge bring about a noticeable change; (cause to) develop into another status
引起明显变化；(使)进入另一状态
Exercising too much with no iron supplements will tip one over the edge into a more serious deficiency.
锻炼太多而又未服铁质补剂,可能改变人体的含铁量,使之处于严重缺铁状态.