Chotto / Sukoshi means ''a little'' as you might know.
Useful Japanese phrase ''Chotto ちょっと'' for making a negative reply. Just by saying ''Chotto...'' when you have to make a negative reply. ''Chotto'' in this case, is a unique Japanese expression which is irregular way. And it doesn't mean ''a little''. Therefore you can't just say ''sukoshi...'' for making a negative reply. It doesn't make sence. This is advanced Japanese lesson :)
- Example -
When I ask you to come to the party or something, you might don't really feel like to go but you don't feel comfotable to make a negative reply to me. Then you may say ''Chotto...''
Saying ''chotto'' like this makes the situation ease up a little. It depends on what kind of situation you are in but it's very useful phrase to use sometimes. This is just a unique Japanese expression. If you can use it like us, you are fluent Japanese speaker.