Come/Come up

English as a Second Language English Vocabulary, Grammar and Idioms
1
  1. Come up quickly.
  2. Come quickly.
    Do they mean the same?
    Are they interchangeable?
2

“Come up quickly” means come in a direction perceived as “up”. Often this will be literally up, such as up the stairs in a house. Sometimes it may be figuratively up, such as “up” to a large city from a smaller place.