Related Clues:

• Line of symmetry
• x or y, e.g.
• x, y or z
• Stem
• Allies' foe in W.W. II
• Pivotal point
• Vertical graph component
• The second cervical vertebra
• Coordinate system line
• Main line?
• Alliance
• Geometric vertical
• On what the earth turns
• Bottom line?
• Allies' adversary