In Latin, the suffix '-bus' is a dative or ablative plural ending that indicates the indirect object of a verb. It is commonly used in Latin nouns to denote the recipient or beneficiary of an action. For example, "liberis" means "to/for the children" where "liber-" means "children" and "-is" is the dative/ablative ending.
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That ending is really -ibus, which is added to the stem of certain 3rd and 4th declension nouns to form the dative and ablative plurals.
So the stem of the noun dux (a leader) is duc-; if you add -ibus to that stem you get ducibus, meaning with, by, for, to, in, from or at leaders. The exact translation depends on the other words in the sentence and how the word is being used. A Latin word should never be taken out of context as this will often make translation impossible.