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chicken out▼◼◼◼(shy away from a daring task)
verb

bottle [bottled, bottling, bottles]▼◼◻◻(refrain from doing (something) at the last moment because of a sudden loss of courage)
verb
[UK: ˈbɒt.l̩] [US: ˈbɑːt.l̩]

bottle out▼(to fail to perform a promised or planned action due to lack of courage or nerve)
verb