happen : Idioms & Phrases
happen upon
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verb find unexpectedly
fall upon; attain; come upon; chance upon; discover; light upon; come across; strike; chance on.
- the archeologists chanced upon an old tomb
- she struck a goldmine
- The hikers finally struck the main path to the lake
WordNet
no matter what happens
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adverb in spite of all obstacles
whatever may come; come hell or high water.
- we'll go to Tibet come hell or high water
WordNet
To happen in
- to make a casual call. Colloq.
Webster 1913
To happen on
- to meet with; to fall or light upon. "I have happened on some other accounts." Graunt.