Meaning : Find unexpectedly.
Example :
The archeologists chanced upon an old tomb.
She struck a goldmine.
The hikers finally struck the main path to the lake.
Synonyms : attain, chance on, chance upon, come across, discover, fall upon, happen upon, light upon, strike
Meaning : Take possession of.
Example :
She entered upon the estate of her rich relatives.
Synonyms : enter upon, luck into
Come upon meaning in Bengali (Bangla).