curve
In French, the word 'courbe' is used to describe a curve or bend in a line or surface. It can be used as a noun or an adjective, and can refer to a mathematical curve, a road with many curves, or the curve of a body part. For example, one might say 'la courbe de la route' to refer to the curve in the road, or 'une courbe douce' to describe a gentle curve.
The curve of the road is dangerous.
In this case, 'courbe' refers to a bend or turn in the road that must be negotiated with care due to potential danger.
I am studying the growth curve of the plant.
In this phrase, 'courbe' is used to refer to a graphical representation (curve) that depicts the rate at which a plant grows over time.
The interest rate curve has fluctuated this year.
Here, 'courbe' refers to a line graph representing the change in interest rates over the time period of year. The term suggests that there have been variations in the observed interest rates during the year.