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##### The Collaborative International Dictionary
Reverse curve

Reverse \Re*verse"\, a. [OE. revers, OF. revers, L. reversus, p. p. of revertere. See Revert.]

1. Turned backward; having a contrary or opposite direction; hence; opposite or contrary in kind; as, the reverse order or method. ``A vice reverse unto this.''
--Gower.

2. Turned upside down; greatly disturbed. [Obs.]

He found the sea diverse With many a windy storm reverse.
--Gower.

3. (Bot. & Zo["o]l.) Reversed; as, a reverse shell.

Reverse bearing (Surv.), the bearing of a back station as observed from the station next in advance.

Reverse curve (Railways), a curve like the letter S, formed of two curves bending in opposite directions.

Reverse fire (Mil.), a fire in the rear.

Reverse operation (Math.), an operation the steps of which are taken in a contrary order to that in which the same or similar steps are taken in another operation considered as direct; an operation in which that is sought which in another operation is given, and that given which in the other is sought; as, finding the length of a pendulum from its time of vibration is the reverse operation to finding the time of vibration from the length.

##### Wikipedia
Reverse curve

In civil engineering, a reverse curve (or "S" curve) is a section of the horizontal alignment of a highway or railroad route in which a curve to the left or right is followed immediately by a curve in the opposite direction.

On highways in the United States reverse curves are often announced by the posting of a W1-4L sign (left-right reverse curve) or a W1-4R sign (right-left reverse curve), as called for in the Manual on Uniform Traffic Control Devices.

#### Usage examples of "reverse curve".

The flames danced about my shoulders, and I thought of a series of half moons as I traversed arc after arc, curve upon reverse curve.

The first curve went well, but when she hit the reverse curve, Orb got confused and started to lean the wrong way.

He braced his palms against a tree-truck and stretched until he'd bowed his back into a reverse curve.

How could anybody build a boat with a stem got a reverse curve in it?

It was heavy, the blade nine inches long, the edge sweeping to meet the reverse curve from the back, the point needle-sharp at the union.

It was a flat, rather bovine countenance, with heavy lines dragging the mouth into a reverse curve.

Executed a double-right-angle reverse curve, thus missing by hair's breadths two vehicles traveling in the opposite direction and one in his own.

The other is a left-handed reverse curve bow I bought from an obliging reader in Kiss-Mee.

Its edges actually touched the ground all around, sloping upward and over the top in such a smooth reverse curve that the harder the wind blew the more firmly was the vehicle pressed downward.

It was something on the order of a sailor's dirk, though single-edged, with a peculiar reverse curve at the tip.