2226: balk Jan 18, 2021

The word 'block' these days pretty obviously means 'keep from moving', originally from a physical source, but there are other words like that too. 'Balk' for instance originally referred to a partition, or especially unplowed land on a field. The sense of being blocked by an obstacle then led to the modern sense of to make a blunder or to hesitate. It is even related to 'balcony', originally from the sense of 'beam', as was the case with 'block'.

2225: block Jan 17, 2021

The original sense for a block was that of a large, solid piece of wood. This was only generalized in the late Middle Ages to mean 'any solid piece', originally with the senses of an executioner's block, and then later a stump from which to sell slaves. Other Germanic languages have related words connoting trees or large planks of wood, but the English block eventually related to anything solid, usually prismatic etc. to the point as a verb (or as a noun in 'blockade') it came to mean 'prevented from moving'. This is also related to bloc, which in Old French simply meant 'log', but now in English means a solid group, especially referring to political entities.