There are 2 definitions of Rat Pack in English:

Rat Pack1

Syllabification: Rat Pack

noun

informal
A group of five friends and co-performers prominent in the entertainment industries of Hollywood and Las Vegas in the 1950s and 1960s. The group (Frank Sinatra, Dean Martin, Sammy Davis, Jr., Joey Bishop, and Peter Lawford) made several movies together, including Ocean’s Eleven (1960).

Definition of Rat Pack in:

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Word of the day impudicity
Pronunciation: ˌimpyəˈdisitē
noun
lack of modesty

There are 2 definitions of Rat Pack in English:

rat pack2

Line breaks: rat pack

Entry from British & World English dictionary

noun

British informal
A ration pack issued by the army to men on duty away from base camp.

Definition of Rat Pack in: