köken: From Czech or Slovak, compare Czech dialectal ploščka, ploška, plošťka (standard ploštice⁽ᶜˢ⁾), from Czech and Slovak ploský (“flat”). A Slovak form exactly corresponding to Hungarian may have existed but is not attested (cf. Slovak ploštica⁽ˢᵏ⁾). The sense “intercept device” is a calque of German Wanze and English bug.