What does it mean when a surface is described as "flush"?

When a surface is described as "flush," it refers to the condition where two surfaces are even and aligned with each other, creating a smooth transition without any protrusions or indentations. The term signifies that the surfaces are contiguous and at the same level, ensuring that there are no gaps or overlaps.

In this context, the translation "bündig" accurately captures this meaning, as it also denotes surfaces that are aligned or even with each other. This concept is commonly applied in design and construction contexts, where the fit of materials and components is critical for both aesthetic and functional reasons.

The other choices do not convey the specific alignment or level surface characteristic that "flush" describes. Thus, "bündig" is the appropriate term to express this concept accurately in the given context.