Definition of Ruby, Jack in English:

Ruby, Jack

Syllabification: Ru·by, Jack
Pronunciation: /ˈro͞obē/

Entry from US English dictionary

( 1911–67), US nightclub owner; born Jack Rubenstein. On November 24, 1963, he shot and killed Lee Harvey Oswald, the man accused of murdering President Kennedy. The act was captured on national television.

Definition of Ruby, Jack in:

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Word of the day demoralize
Pronunciation: dɪˈmɒrəlʌɪz
cause (someone) to lose confidence or hope