The phrase "guillotine style" refers to doing something in a swift, decisive, and sometimes brutal manner, just like the way a guillotine swiftly and decisively cuts off the head. Full definition
With guillotine style clippers, the blades clip the nail vertically when you squeeze the handles together. (topdogtips.com)
The Grip Soft Nail Trimmer is an easy to use guillotine style nail trimmer to help make trimming your pets nails safe and stress free. (dog-grooming-training.com)
When the armrest was placed down, it trapped my sons finger guillotine style, which resulted in a deep cut. (havebabywilltravel.com)