i Register
In some senses, obo is marked as colloquial. Watch for register when choosing this word.
noun
Alternative form of ovoo (“Mongolian cairn”).
phrase
Alternative letter-case form of OBO: or best offer
noun
Initialism of ore-bulk-oil: designating a ship designed to be capable of carrying wet or dry cargoes.
Ellipsis of OBO carrier
Ellipsis of orbital box osteotomy