used instead of the main verb in questions that are added to the end of a sentence to check information:
Fallen back on sth
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to use something, especially a form of financial support, when other things have failed:
Fallen back on sth meaning & definition 1 of Fallen back on sth.
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to have something you can use or do if what you originally planned to use or do is not available or not possible:
Fallen back on sth meaning & definition 2 of Fallen back on sth.
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