Fly Casting Glossary: Key Terms Explained
Plain-English definitions of casting arc, D-loop, anchor, key position, tracking, double haul and more — with links to the full guide for each.
Casting arc
The rod's total rotation through a stroke, from the back of the backcast to the front of the delivery. It should widen as line length increases — compact for a short line, wider for a long one.
Loop
The bend the fly line forms in the air as it unrolls, shaped directly by the path the rod tip travels and the crispness of the stop. A tight loop is efficient and accurate; an open loop wastes energy and distance.
Tailing loop
A loop that crosses itself, usually caused by the rod tip dipping and then rising again mid-stroke — a concave path — rather than travelling in a straight line.
D-loop
The loop of line hanging in the air behind you once a roll cast or Spey cast's setup is in place. The bigger and cleaner it is, the more energy the forward stroke has to work with.
Anchor
The section of line still resting on, or in contact with, the water that the rod loads against — in place of a backcast. Central to the roll cast and every Spey cast.
Touch-and-go anchor
An anchor that briefly touches the water and lifts straight off again as you deliver, all within one continuous sweep — the anchor style used by the single Spey.
Waterborne anchor
An anchor that stays in contact with the water throughout the sweep and D-loop formation, held there by surface tension — used by the double Spey specifically because it survives an upstream wind that would blow a touch-and-go anchor away.
Key position
The loaded, held stance at the top of a roll cast's lift or a Spey cast's sweep, reached just before the forward delivery — where the D-loop finishes forming and the anchor settles.
Sweep
The continuous rod movement, in a Spey cast, that lifts the line, forms the D-loop and sets the key position — a single unified motion, not an in-and-out.
Backcast
The rearward stroke of an overhead cast, which loads the rod against thin air — unlike a roll cast or Spey cast, which load against the water via an anchor instead.
Rod loading
The bending of the rod under the weight and speed of the line moving through the stroke, storing energy that releases back into the line the instant the rod stops. The physics behind every cast.
Tracking
Keeping the rod tip travelling in one straight vertical plane through the whole cast, so the backcast and forward cast line up rather than crossing or drifting apart.
Double haul
A line-hand technique layered onto a cast — most often the overhead — pulling sharply on the line as the rod accelerates toward each stop, adding real line speed and distance.
Presentation
The final moment of a cast, where the line settles the fly onto the water — ideally landing first and straight, rather than slapping down.
Cack-hand cast
Casting from the opposite shoulder to your natural casting side — often the safer option for a double Spey in a genuinely strong upstream wind, since it puts your body between the wind and the D-loop.
Put these terms into practice
Every one of these comes up in Fly Cast Coach's step-by-step guides — your phone becomes the rod, scored phase by phase.
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