申し込む
もうしこむ · moushikomu · JLPT N3 · verb-godan
to apply for
📝 申す humbly say + 込む put into = humbly put your request in: apply
申す is the humble verb for saying, and 込む means going or putting into something. To apply is to politely send your words into an office or onto a form. The same 込む is in 書き込む, to write into a form.