To change, alter, revise, or replace something (such as rules, plans, or expressions).
会社は来月、就業規則を改める予定だ。
The company plans to revise its work regulations next month.
文法の誤りを見つけたので文章を改めた。
I found a grammar mistake, so I altered the sentence.
To reform, correct, or improve behavior or habits; to mend one's ways or make things better.
遅刻癖を改めるために早起きするようにした。
I started waking up early to correct my habit of being late.
彼は自分の態度を改め、もっと協力的になった。
He changed his attitude and became more cooperative.
To examine, check, or inspect something (such as documents, luggage, or identity).
警官が入場者の身分証を改めた。
The officer checked the attendees' IDs.
税務署員が帳簿を改めるために会社を訪問した。
A tax official visited the company to inspect the books.
To do something properly or formally; to carry out an action in a proper, official, or correct manner.
改めてご挨拶申し上げます。今後ともよろしくお願いします。
I would like to formally greet you again. I look forward to your continued support.
契約内容を改めて確認してからサインしてください。
Please check the contract details properly before signing.