1. To put two or more things forcefully into something very close together and in a haphazard manner. A noun or pronoun can be used between "jam" and "together." Don't just jam all these things together in the box like that—you'll break something! He jammed together all of the cleaning supplies into a box under the sink.
2. To connect, construct, or assemble something very hastily, carelessly, or with brute force. A noun or pronoun can be used between "jam" and "together." No matter how hard I jammed together the two parts, they wouldn't connect the way they were supposed to. She decided to jam the pieces back together with some super glue and hope for the best.
3. To cause two or more people to be very close together inside of something. A noun or pronoun can be used between "jam" and "together." They jammed about 50 of us together in a cramped conference room with no air conditioning for the two-hour-long meeting. We somehow managed to jam together the entire team onto that tiny bus.
4. To schedule many things to happen within a relatively short period of time. A noun or pronoun can be used between "jam" and "together." They jammed together 20 different musical acts over the course of the festival. I usually don't like jamming so many activities together like that, but I only had two weeks, and I didn't know when I would have the opportunity to visit Japan again.
5. slang To play unrehearsed or improvised music together. I like the way you sound on bass guitar. We should jam together sometime. A lot of local musicians come to this bar to jam together on the weekends.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
jam someone or something together
to pack people or things close together. The usher jammed everybody together so more people could be seated. Don't just jam the boxes together! Sort them out first.
jam something together
to assemble something hastily or carelessly. The fragile contents were just jammed together in one box and everything was broken. The thing was just jammed together with no care at all.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.