"How to say [something] in English" is a common question asked when seeking to learn the language. The most concise way to answer this question would be "What is the English translation of [something]?" This question is usually followed by the specific word or phrase that needs to be translated.
For example, if someone asks "How do you say 'apple' in English?", the answer would be "The English translation of 'apple' is 'apple'."
It is important to note that translating words or phrases from one language to another can often involve more than just finding the exact equivalent phrase in the other language. Context, slang, and cultural meanings may also need to be considered when translating.