JC Nesfield wrote: “There is scarcely any part of speech that has lent itself more readily to metaphorical usage than prepositions.

Source: https://www.freepressjournal.in/bhopal/writing-tools-across-means-crossing-it-indicates-right-angles

With TGG, the ‘parts of speech’ – nouns, pronouns, verbs, adverbs, adjectives, prepositions, interjections, conjunctions, determiners and articles – together with some of their definitions became somewhat irrelevant.

Source: https://nigerianobservernews.com/2023/05/interpreting-section-134-of-the-nigerian-constitution-with-dead-english/