I'd say the phrase 'one-on-one meeting' sounds much more natural.
The term 'one-to-one' is more often used in the with any of the following:
- one-to-one relationship
- one-to-one function
- one-to-one mapping
"Stuff" is informal, especially when used as a de facto pronoun. "Stuffs" is normally used as a verb, not as a plural pronoun.
"Thing" is a standard pronoun, so it can be used in both formal and informal writing. "Things" is a normal plural pronoun.
I am going to give my children food, clothes, and other things.
sounds formal. "I am going to", "give", and "children" are all formal choices of words.
I am going to give my children food, clothes, and other stuff.
sounds informal enough to almost seem incorrect. Using "kids" instead of "children" would make the sentence more consistently informal. Using colorful metaphors (like "put clothes on my kids' backs" or "put food in my kids' bellies") would also be more consistently informal than "give my children <things>".
In informal speech, it is normal to use contractions for some words. Even in informal writing, it is normal to transcribe these words using the full words. Thus, your written "I am going to give" might be spoken informally as "I'm gonna give".
Best Answer
Quick online search finds an answer here: http://www.thefreedictionary.com/behalf. Quoting a note on this page (all emphasis added is mine):
I would also add that "on behalf of me" sounds awkward; instead, "on my behalf" would sound a lot better. Second, in this particular phrase, using "on behalf of" seems out of place; instead you can say "instead of me" (in my opinion).