słownik polsko - angielski
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prosta linia po angielsku:
1. 
straight line
So, even a straight line, defined with calculus, is a curve.
Angielskie słowo "prosta linia" (straight line) występuje w zestawach:
angielski rozdział 22. 
beeline
The kids made a beeline for the TV.
As soon as work is over, he makes a beeline for the pub.
Make a beeline for Mike. He is looking forward to you. At parties he always makes a beeline for the prettiest woman in the room.
If you want to go there in time, you'd better make a bee-line for your class right away.
solid line