BREAKING THE MOULD
Putting an end to a pattern of events or behaviour, especially one that has become rigid and restrictive, by doing things in a markedly different way. If someone or something breaks the mould, they completely change the way something has traditionally been done, and do it in a new way - Idioms by The Free Dictionary
To engage in a comfortable, friendly interaction. Originally, the term was literal, meaning that a loaf of bread would be broken to share and eat; a casual meal among associates. Today, the term is used to describe a social interaction where something is shared. This could be food, money, commodities, assets, or other various items. To break bread is to affirm trust, confidence, and comfort with an individual or group of people. Breaking bread has a notation of friendliness and informality, derived from the original meaning regarding sharing the loaf - urbandictionary.com
When you hear someone talking about a big break, this is an informal way to talk about a sudden opportunity or quick success, especially when it comes to a career. Let’s say there’s an actress who has only had minor parts for many years, but she gets a big break when she’s given the leading role in a major movie. This is a sudden great opportunity, and it implies that she will have continued success after it - espressoenglish.net
To break through means to make a quick advance, especially through an obstacle. You’ll often hear this in the noun form when talking about a breakthrough. If scientists are trying to develop some new technology, and they make a breakthrough, it means they have suddenly gotten past the challenges, and made great new progress - espressoenglish.net
BREAK OF DAWN
When talking about nature, we have a few different expressions with the word break.
When we say the break of day, the break of dawn, or daybreak, we are talking about the very beginning of the day, when the sun first comes up.
If we say a storm broke, it means the storm begins.
We can also say an ocean wave breaks (see below) when it reaches its highest point and then starts to collapse down.
In fluid dynamics, a breaking wave or breaker is a wave whose amplitude reaches a critical level at which some process can suddenly start to occur that causes large amounts of wave energy to be transformed into turbulent kinetic energy. There you go, don't say we never tell you anything! Wikipedia