brush up on  - to improve your knowledge of something already learned but partly forgotten:, to come up with - to suggest or think of an idea or plan:, to face up to - to accept that a difficult situation exists:, to figure out - to finally understand something or someone, or find the solution to a problem after a lot of thought:, to hit upon - to think of an idea when you didn't expect or intend to, especially one that solves a problem:, to mull over - to think carefully about something for a long time, to piece together  - to create something by joining the separate parts of it together or by joining different things together, to think up  - to produce a new idea or plan, to think through - to consider something carefully, to puzzle out - to discover or understand something by thinking hard about it, to wear out  - to make someone extremely tired, to change around - to move objects such as furniture into different positions, to back up - to copy information held on a computer that is stored separately from the computer, to do away with - to remove or put an end to something., to do up - to repair something old, to use up - to use all of a stock or supply of something., to take apart - to separate the parts of something so that they are not together,

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