The antonyms for the word "more short-end" can be "less short-end," "longer," or "lengthier." When we use the term more short-end, we refer to something that is shorter than other similar things or having a shorter lifespan. Its antonyms, on the other hand, refer to something that is longer, bigger, or more extended. For example, if we compare two pencils, and one is more short-end than the other, we can say that the latter is longer. Similarly, if we compare the lifespan of two products, and one has a more short-end lifespan, we can say that the other product has a longer lifespan. In summary, the antonyms of more short-end describe something that is longer, bigger, or more extended.