1. Precisely in that way, very carefully and appropriately, as in The children had to be dressed just so for their aunt's wedding. [Mid-1700s] 2. I agree, that is correct, as in The house was a mess.? Just so; I told her to clean the place up. [Mid-1700s] 3. See JUST AS, def. 2. 4. See AS LONG AS, def. 3.
American Heritage Idioms
Phrase(s): just so
1. in perfect order; neat and tidy. • Her hair is always just so. • Their front yard is just so. 2. Precisely right!; Quite right! (Usually Just so!) • Bill: The letter should arrive tomorrow. Tom: Just so! • Jane: We must always try our best. Martin: Just so!
McGrawhill's American Idioms And Phrasal Verbs