carry through
carry through {v.}
1a. To put into action.
Mr. Green was not able to carry through his plans for a hike because he broke his leg.
1b. To do something you have planned; put a plan into action.
Jean makes good plans but she cannot carry through with any of them.
2. To keep (someone) from failing or stopping; bring through; help.
When the tire blew out, the rules Jim had learned in driving class carried him through safely.
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Source: A Dictionary of American Idioms