Basically for me it goes like this:
When a lyrical MC does not imply nor say who/what exactly they are talking about, this leaves it open to suggestion as what is being perceived

To inform all users on how to prepare and educate themselves before dealing with such lines, know the literary devices being used, to already brainstorm as to what they MAY MEAN

Use this free "photojoiner" site to instantly combine, several images (up to 4 max as cube , 3 horizontally/vertically) to immediately clarify the imagery of any given set of lines. THIS ALSO saves about 3/4 of annotating space! No more crowding and stacking images! Your tates will be cleaner, more direct and professional!

Here are 5 different instances of this very common issue and ways to go about, handling each situation
1. This can lead to up to 3-4 interpretations of one line itself, when analyzing the fragments around it
2. Context clues in the description around said "vague line" therefore help to fill in the blanks, which is the exact opposite of reaching
3. Diction (word choice) and vocabulary (word bank) may indicate a theme, main idea or concept. Terminology (word classification) is a term that indicates a special topic usually a specific subject of study that is classified by field. Here are 3 sites to assist you in being familiar with all 3 things:
3B. Dictionary
3C. Thesaurus
3D. Terminology
4. Wordplay, similes and metaphors help the most in getting whatever they are talking about specifically in a concise manner. Imagery paints a very relevant picture to put things all in perspective
5. Most of the definitions of the "focus words" shed, further details and a deeper analysis to gather the whole meaning of the lines