To mull over something (or mull something over) is to think very carefully about something over a period of time – usually before making a decision. Examples of use: 1. I'll mull over your ideas and let you know my decision tomorrow. 2. I need to mull things over for a few days before I [...]

To tinker with something is to make small changes to something, often in an unskilled way, to try and repair it or improve it.   Examples of use: 1. He's been tinkering with that old car for months. The engine still won't start. 2. My grandfather loved tinkering with clocks and watches. 3. My husband [...]