Celtic have put in similar performances this season to the one they delivered at Tannadice, but come away with three points. Think of the late wins at Kilmarnock and Livingston, or the narrow victory at Falkirk.
But against United, they looked beach-bound on a pitch that had more sand than grass.
The hosts created more, had more quality in the final third, and carried more of a threat. Celtic’s front three struggled all game.
“They couldn’t create anything,” said former Parkhead goalkeeper Pat Bonner. “They’ve no striker that can turn a game when they’re not playing well.
“I’ve seen it in the past, many a good striker that hasn’t offered anything in a game but they have that ability to get you a goal when you were struggling.
“That doesn’t seem to be there at the moment.”
Kelechi Iheanacho made his first start in the league since October, having had just one substitute appearance and a 35-minute League Cup final cameo in the interim.
Tomas Cvancara, who has started five league games since arriving in January, was ill. Junior Adamu, another winter addition, has started twice and been substituted at half-time in both.
“They look fragile,” Bonner said of his former club. “Celtic are really under pressure now. The question will be from many now, is that their championship gone?”