Here are some common English expressions which could be useful in many different situations:
Save a bundle – save a lot of money.
Ex: I saved a bundle by buying things on sales.
Save one’s breath – it’s no use talking to someone if they’re not listening.
Ex: Save your breath! They can’t hear you because of the noise.
A penny saved is a penny earned – it is wise to save money.
Ex: The manager advised everyone to save and said that ‘a penny saved is a penny earned’.
Save for a rainy day – to put some money aside for unexpected difficulties.
Ex: Fortunately, Sue had some money saved for a rainy day.
A stitch in time saves nine – it is better to deal with problems immediately before they deteriorate.
Ex: You should deal with that problem now. You know what they say – a stitch in time saves nine.
Saved by the bell – when something happens and interrupts difficult situation.
Ex: Luckily, someone opened the door so I didn’t have to answer the unpleasant question.
To save the day – to do something that solves a serious problem.
Ex: Helen’s mother saved the day when she gave us some money for the taxi.