Foilers

Part of speech: noun, verb

Definitions

1. Individuals or devices that prevent success or completion; a type of thin metallic sheet used in cooking or packaging; participants in a form of fencing competition where swords are used
2. Persons or objects that obstruct or defeat plans; flexible metal sheets commonly for wrapping or insulating; athletes engaging in a sport with a light thrusting sword called a foil
3. Those who thwart or oppose efforts; thin sheets of metal used for covering food or insulation; competitors in a duel-like sport utilizing lightweight blades called foils

Etymology: "Foilers" is the plural of "foiler," which is "foil" with the suffix "-er" attached, meaning one who or that which foils. The verb "foil" goes back to Old French "fouler," meaning to trample or press down, and its sense of thwarting came later, from the idea of frustrating someone by trampling on their plans. The metal sheet sense of "foil" is a separate lineage, from Latin "folium" (leaf), which passed through Old French "foille" and reached English as a word for thin beaten metal, and this is also where the fencing sense comes from, since a foil is a light practice sword with a blunted tip. The plural form "foilers" is the one you would meet for people or devices that thwart things, so the suffix does the work of turning an action into a doer.