1. (

• blackjack_oak ,
• blackjack ,
• jack_oak ,
• Quercus_marilandica

) a common scrubby deciduous tree of central and southeastern United States having dark bark and broad three-lobed (club-shaped) leaves; tends to form dense thickets ;

2. (

• blackjack ,
• cosh ,
• sap

) a piece of metal covered by leather with a flexible handle; used for hitting people ;

3. (

• black_flag ,
• pirate_flag ,
• Jolly_Roger ,
• blackjack ,

) a flag usually bearing a white skull and crossbones on a black background; indicates a pirate ship ;

4. (

• blackjack ,
• twenty-one ,
• vingt-et-un

) a gambling game using cards; the object is to hold cards having a higher count than those dealt to the banker up to but not exceeding 21 ;

1. (

• blackmail ,
• blackjack ,
• pressure ,

) exert pressure on someone through threats ;