What does cross-check mean in different contexts?

Cross-check is a term used in various contexts, but here are some possible meanings based on the questions you've asked:

1. In hockey, cross-checking is a penalty called when a player uses their stick or body to check an opponent across the shoulders or chest, rather than checking them from the side or along the boards. This type of check is illegal and can result in a penalty being called against the offending player.
2. In aviation, cross-check refers to a safety procedure where pilots use a second set of instruments or a backup system to verify the accuracy of their primary instruments or systems. This is done to ensure that the aircraft is flying safely and to prevent accidents caused by instrument failure or other issues.
3. In finance, cross-check can refer to a process used to verify the accuracy of financial data or transactions. This may involve comparing different sets of data or systems to ensure that they are consistent and accurate, or it may involve using multiple sources of information to verify the validity of a particular transaction or financial statement.
4. In software development, cross-check can refer to a technique used to verify the correctness of software code or algorithms. This may involve comparing different parts of the code or running tests to ensure that the software behaves as expected.

Overall, the term "cross-check" is often used to describe a process or procedure that involves verifying the accuracy or validity of something by comparing it to multiple sources or using multiple methods.