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tide someone over (until something)
to supply someone until a certain time or until something happens. Will this amount tide us over until next week? There is enough food here to tide over the entire camp until next month. Yes, this will tide us over.
Support through a difficult period, as in I asked my brother for $100 to tide me over until payday. This expression alludes to the way the tide carries something. [Early 1800s]
To sustain or support someone or something through a period of deficiency or absence: A $100 loan would tide me over till payday.