on the brink of

\r > With my pending at work and the amount of people calling me each day I'm on the brink of desk rage and one day I'm going to break and take it out on that weird guy that sits next to me.

See also, "Land it like Sully." > The company is on the brink of failure, so let's Land it in the Hudson.

the frustrated feeling of being on the brink of something fantastic but never actually tasting that satisfaction. > She teased me forever - I would have complained but it was the best neargasm of my life.