officiate /əˈfɪʃiˌeɪt/ verb officiates; officiated; officiating
officiates; officiated; officiating
Learner's definition of OFFICIATE
1
formal : to perform the official duties of a ceremony履行公务;主持(仪式) [no object]
—
usually + at [+ object]
2
sports : to be a referee, umpire, or judge at a game, tournament, etc.担任裁判 [no object]
—
usually + at [+ object]