To see a line in your dream symbolizes duality, limits, boundaries and rules. It may also reflect movement, progress, or a lack thereof. Alternatively, it could reflect a direction in life you are headed (good/bad, health/sickness, rich/poor). A straight path towards a goal.
To dream that you are crossing a line represents overstepping a boundary or moving beyond the limits of some area of your life.
To see a line of people or objects may represent an area of your life that is being prioritized. It could also point to an area of your life that needs your full attention.
To dream of standing in line may represent something you are waiting for in waking life. It may also reflect impatience. You may not feel that your needs are a priority. Other people may seem to always come before you. Standing in line could also represent your feelings about where you stand in relation to others. You may feel you deserve more.
To dream of someone cutting in from of you in the line you are standing in represents feelings about other people getting unfair preferential treatment. Fear of losing your role or placement at work. Concerns with others having to do less then you to achieve the same goals.
Example: A woman dreamed of seeing someone cut in the line she was standing in. In waking life she was concerns about losing her position and tenure at work if she took maternity leave.
Example 2: A man dreamed of being in a room with red line on the floor and a Gypsy across from him. In waking life he was living with an attractive roommate who flashed her breasts at him. He was secretly wondering what the “boundaries” were in the living arrangement because he wanted to have sex with her. The line may have reflected his concerns about when his behavior towards her would be considered “crossing the line.”