I too am confused by the mixed use of terms in this regard. Like
Leatherman, "pinch-grip" evokes images of
pinching the blade for closer work like skinning or chopping/slicing small things with an over-long knife, a common practice with a wide variety of cutting implements from machete's to razor-blades. This is what I would describe as a "pinch-grip", and it is how it has been described to me.
The tight but free-rotation grip being described I've heard called an "index-grip" and "rapier/fencing-grip". Even if these are inaccurate (afterall, 'rapier' is a German word for a Spanish sword-style), they correctly evoke the image of index-finger & thumb
wrapped around the handle and controlling the motion of the blade while the distal fingers remain looser and allow the pommel to rotate as needed around the forefingers for increased agility and blade-snaps. The effectiveness of this terminology argues for its 'correctness'.
But as was pointed out, most 'rapiers' employ quillions and a ricasso below the guard for controlled grip and are stabbing tools, while most machetes have only the ricasso and are primarily slashing tools. Since other grips-positions take their names from the way
other tools are held (e.g. hammer, ice-pick), perhaps there should be a term "machete-grip" or less dogmatically "slash grip"? Afterall, this grip is employed for
slashing regardless of the bladed tool, just like the "pinch-grip" both
Leatherman & myself are familiar with - machete, sword, scalpel, pocket-kinfe. Wrapping fingers around the handle is not "pinching", so it is no surprise if many are confused by such terminology. Then again, it would not be the first time that a word is applied to something that it does not describe
To
FortyTwoBlades, the Duluth Trading Company sells
Men's work-gloves Size Small (not US-made) for those of use with medium/small hands that are still too burly for Large-size women's gloves. These in particular fit my hands well whereas the largest size made for women are too snug.