Wiktionary
vb. To become deeply involved (''in'' something).
Usage examples of "lose oneself".
If one does not get lost on the way one is bound to lose oneself in these towns, and to avoid them is impossible on account of their size.
Night was already sufficiently advanced to render it possible to lose oneself at a little distance and yet there was sufficient daylight to permit of recognition at close quarters.
Too, in the barbarian situation there was commonly at hand no maze of nameless streets, no anonymous crowds, so to speak, in which one might immediately lose oneself, seeking escape or refuge.
However, if you would truly be interested in seeing a place in which it is easy to lose oneself, we could show you the catacombs.
It is a world so inspiring of awe that one can lose oneself in it, for one man seems so insignificant.
A more practical restraint was Killashandra's recognition that it would be easy to lose oneself beyond the curiously reassuring flatness of the plain and the sight of the White Sea.
He felt that it was more dignified to lose oneself in business, as he intended to do, than in alcohol, as Tom was probably doing.