All 6 Uses

revert
in
The Bourne Supremacy
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'Goddamn it!' shouted Jason in English, instantly reverting to Chinese.†
Chpt 13
A master of his craft — his art, perhaps — the orator knew when to revert to the gospel of love, momentarily omitting Lucifer.†
Chpt 27
The orator reverted to Mandarin, issuing orders as the impostor returned to the tree and lit a cigarette.†
Chpt 27 *
There is no rendezvous,' answered Echo, reverting to English.†
Chpt 27
Worse, any attempt at exposure would risk a backlash so severe that Peking would cry insult and outrage, and revert to suspicion and intransigence.†
Chpt 33
'Bu xiexie,' said the undersecretary of state, declining, and then for courtesy's sake reverting to English to show respect for his host's diligence in learning it.†
Chpt 37

Definitions:

(1) (revert as in: revert to childish ways)
go back to a previous state
(2) (meaning too rare to warrant focus)
Revert or reversion can also have a specialized meaning in the law with regard to property. Archaically, it can refer to physically turning away from something. In Indian English, it can mean to reply.