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nail somebody down to somebody's promise▼[UK: neɪl ˈsʌm.bə.di daʊn tuː ˈsəm.ˌbɑː.di ˈprɒ.mɪs] [US: ˈneɪl ˈsʌm.ˌbɑː.di ˈdaʊn ˈtuː ˈsəm.ˌbɑː.di ˈprɑː.məs]
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