1. (

• jam

) preserve of crushed fruit ;

2. (

• fix ,
• hole ,
• jam ,
• mess ,
• muddle ,
• pickle ,
• kettle_of_fish

) informal terms for a difficult situation; "he got into a terrible fix"; "he made a muddle of his marriage" ;

3. (

• crush ,
• jam ,
• press ,

) a dense crowd of people ;

4. (

• jamming ,
• electronic_jamming ,
• jam

) deliberate radiation or reflection of electromagnetic energy for the purpose of disrupting enemy use of electronic devices or systems ;

1. (

• throng ,
• mob ,
• pack ,
• pile ,
• jam

) press tightly together or cram; "The crowd packed the auditorium" ;

2. (

• jam ,

) push down forcibly; "The driver jammed the brake pedal to the floor" ;

3. (

• jam ,
• crush ,

) crush or bruise; "jam a toe" ;

4. (

• jam ,
• block

) interfere with or prevent the reception of signals; "Jam the Voice of America"; "block the signals emitted by this station" ;

5. (

• jam ,

) get stuck and immobilized; "the mechanism jammed" ;

6. (

• jam ,
• jampack ,
• ram ,
• chock_up ,
• cram ,
• wad

) crowd or pack to capacity; "the theater was jampacked" ;

7. (

• obstruct ,
• obturate ,
• impede ,
• occlude ,
• jam ,
• block ,
• close_up

) block passage through; "obstruct the path" ;