- anchor line
- assembly line
- battle line
- branch line
- Brocard line
- Cayley lines
- cell line
- chorus line
- critical line
- end of the line
- Euler line
- fall in line
- flow line
- front line
- Gergonne line
- Green Line
- hold the line
- imaginary line
- isogonal line
- isotropic line
- line dance/line-dance
- line graph
- line manager
- line of fire
- line of sight
- line segment
- line up
- lubber line
- median line
- milk line
- occult line
- on the line
- opening line
- ordinary line
- party line
- Pascal lines
- pedal line
- Philo line
- phone line
- pick-up line
- pipeline
- Plücker lines
- polar line
- police line
- power line
- racing line
- radical line
- real line
- receiving line
- rhumb line
- ridgeline
- secant line
- shebang line
- sign on the dotted line
- Simson line
- skyline
- snow line
- Soddy line
- Solomon’s seal lines
- spring line
- straight line
- streamline
- supply line
- Sylvester’s line problem
- tag line
- tan line
- tangent line
- telegraph line
- telephone line
- timber line
- toe the line
- transmission line
- transversal line
- tree line
- trilinear line
- white line
- world line
- yellow line
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