This is the 12704th most frequent Russian word.
коснется
"Коснется" means "will touch" or "will affect."
In this sentence, "коснется" denotes 'affecting' or 'impacting' someone or something in consequence of a certain action.
Если затронем эту тему, это коснется всех.
If we touch upon this topic, it will affect everyone.
Here, "коснется" is used to mean 'physically touching' or 'making contact' with someone or something.
Не бойся, змея коснется тебя, если ты подойдешь слишком близко.
Don't be afraid, the snake will touch you if you come too close.
In this example, "коснется" expresses 'concern' or 'relate to' someone, indicating that the subject matter has relevance to the person addressed.