A formal variant of 'fall back on'; to use a reserve resource when other options are exhausted.
To use something you kept ready for when you really need it.
One main meaning — here's how to use it.
To use a reserve resource, principle, or skill when primary options have failed; formal equivalent of 'fall back on'.
"With no contemporary legal precedent, the judge was forced to fall back upon centuries-old common law."
To fall backward and land upon something for support.
To use something you kept ready for when you really need it.
Functionally identical to 'fall back on'. The 'upon' form is more formal and more common in written, literary, or official contexts. In everyday speech, 'fall back on' is strongly preferred.
Natural word combinations native speakers use most often.
The five tense forms you'll use most often.
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