Japanese phrase
___までに返答します。 ___ ma de ni hen tō shi ma su
Meaning
I will get back to you by ___.
When to use it
Commits to providing a reply by a stated deadline. It is a natural professional expression that gives reassurance without sounding overly formal.
Example dialogue
この件はいつ返事できますか？ ko no ken wa i tsu hen ji de ki ma su ka
When can you reply about this?
来週月曜までに返答します。 rai shū getsu yō ma de ni hen tō shi ma su
I will get back to you by next Monday.