Ricky Korboa struck in second half stoppage time to condemn the Reds to a 1-0 defeat in Kent on Saturday.
It leaves Worthing without a league win away from home since their 3-0 success at Sussex rivals Eastbourne Borough on Boxing Day – a run of seven games.
Defeat leaves the third-placed Reds six points behind top-of-the-table Dorking Wanderers, who have a game in hand.
The Rebels entertain Maidenhead United, in fifth, tomorrow evening (7.45pm).
See Jay Wrighte’s photos from Worthing’s loss at Tonbridge on this page and the ones linked, and get all the latest Rebels news in the Worthing Herald, out this Thursday.
41. Late Tonbridge goal dents Worthing FC’s title hopes – the match in pictures
A Tonbridge Angels goal at the death put a dent in Worthing FC’s National League South title hopes. Photo: Jay Wrighte
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