@sakora; A jump means just that what it says.

lets use what you are wearing on your avatar for example.

steel thorn bracers is rank 22

demon gloves + copper crest + sea armour = bracers

all 3 of those items are rank 18 in order to rank up and become the bracers it will need a +4 jump see; 18+4=22

minus means it fails. so its subtracted and ranked down.