The opposite of the word "reaching" depends on the context in which it is used. If it is used in a physical sense, such as reaching for something, then the antonym would be withdrawing or pulling back. If it is used in a more metaphorical sense, such as reaching a goal or achievement, then the antonym would be falling short or failing to achieve. Other antonyms that could apply to the word "reaching" include giving up, recoiling, or retreating. Ultimately, the antonym of "reaching" will vary depending on the context in which it is used, and the most appropriate antonym will be the one that best represents the opposite action or outcome.