1. hard work and effort
it's nothing that a bit of elbow grease won't fix
This idiom was originally used to refer to energetic physical labour, especially involving rubbing or polishing. 'Elbow grease' is physical work or labour. However, its use has since extended to refer to any type of hard work or effort. For example, in a professional context, it may take 'quite a bit of elbow grease' to get a task completed or a deal over the line. A phrase that shares a similar meaning is 'blood, sweat, and tears.'