I believe I heard someone use the phrase "the ... (not sure what was here) that causes the dam to break" a while ago, and I understood it's meaning--sort of similar to the last straw--but I can't find anything about this phrase on the internet. I was wondering has anyone around here ever heard it? And would you happen to know what's the correct usage? Help would be very much appreciated.
I've heard "dam" metaphors used in connection with emotion---the "dam breaks" and the pent-up emotion in a person is expressed, usually with crying. (Perhaps the connection is all that water? :)) There isn't any standard "correct usage" as far as I know, just the description of a dam in various stages of stability (breaking, about to break, broken with water pouring through in a great flood, etc.) used metaphorically.