The phrase "official bid" refers to a formal offer made by a person or company to buy something or win a project, which has been authorized and approved by the appropriate authorities. Full definition
We would look like fools making a different official bid now, after all that «firm» stuff this morning. (biggerpockets.com)
Arsenal first official bid for the up and coming summer transfer window, Was a # 750,000 offer for Bolton's 20 year old defender Rob Holding... Hahaha? (justarsenal.com)
Other companies that have expressed an interest in Yahoo include Microsoft, IAC and Time Warner; however, it was not immediately known which companies had submitted official bids. (technewsworld.com)