skimp on (something)
To choose to consume or spend on something very sparingly or frugally as a way of conserving one's money or resources. I got so used to skimping on food when I was broke so that I could afford my rent. Now that I have a decent salary, it's hard not to have the same mentality. We cut corners where we had to so that we could afford the wedding we wanted, but we made sure not to skimp on a good photographer!
skimp on something
to use too little of something; to save something by using less of it than needed for something. Please don't skimp on the gravy. i like my potatoes swimming in it. They skimped on quality a little when they furnished the lobby.
To fail to provide for or supply something appropriately; be stingy with something: That pizzeria always skimps on the pepperoni.