godan verb (-tsu), intransitive verb
give a speech; deliver an address
Used for giving a speech or address, often with a sense of forcefulness or to a large audience. The verb ぶつ adds a nuance of 'hitting' or 'delivering' the speech.
彼は会議で一席ぶった。
He gave a speech at the meeting.
社長が新年会で一席ぶつ予定だ。
The president is scheduled to give an address at the New Year's party.