To "check" means to examine something carefully to ensure it is correct, safe, or functioning properly. This process can involve looking for errors, verifying information, or assessing the condition of an object. For example, a mechanic might check a car's engine to ensure it is running smoothly. In everyday life, people often check items like their homework for mistakes or their email for new messages. Checking can also apply to tasks, such as checking off items on a to-do list to confirm they have been completed. This practice helps maintain organization and accuracy.