Word forms: plural, 3rd person singular presenttense jams, present participle jamming, past tense, past participle jammed
1. variable noun
Jam is a thick sweet food that is made by cooking fruit with a large amount of sugar, and that is usuallyspread on bread.
[mainly British]
...home-made jam.
regional note: in AM, usually use jelly
2. verb
If you jam something somewhere, you push or put it there roughly.
He picked his cap up off the ground and jammed it on his head. [VERB noun preposition]
Pete jammed his hands into his pockets. [VERB noun preposition]
Synonyms: pack, force, press, stuff More Synonyms of jam
3. verb
If something such as a part of a machine jams, or if something jams it, the part becomes fixed in position and is unable to move freely or work properly.
The second time he fired his gun jammed. [VERB]
A rope jammed the boat's propeller. [VERB noun]
Cracks appeared in the wall and a door jammed shut. [VERB adjective]
The intake valve was jammed open. [beVERB-ed]
Every few minutes the motor cut out as the machinery became jammed. [VERB-ed]
[Also V n adj]
4. verb
If vehicles jam a road, there are so many of them that they cannot move.
Hundreds of departing motorists jammed the roads. [VERB noun]
Jam is also a noun.
Trucks sat in a jam for ten hours waiting to cross the bridge. [+ for]
jammedadjective
Nearby roads and the dirt track to the beach were jammed with cars. [+ with]
5. verb
If a lot of people jam a place, or jaminto a place, they are pressed tightly together so that they can hardly move.
Hundreds of people jammed the boardwalk to watch. [VERB noun]
They jammed into buses provided by the Red Cross and headed for safety. [VERB + into]
jammedadjective
The stadium was jammed and they had to turn away hundreds of disappointed fans.
6. verb
To jam a radio or electronic signal means to interfere with it and prevent it from being received or heard clearly.
They will try to jam the transmissions electronically. [VERB noun]
jamminguncountable noun
The plane is used for electronic jamming and radar detection.
7. verb
If callers are jamming phone lines, there are so many callers that the people answering the phones find it difficult to deal with them all.
Hundreds of callers jammed the BBC switchboard for more than an hour. [VERB noun]
The telephone exchange has been jammed all day with people wanting to buy seasontickets. [VERB-ed]
8. singular noun [inNOUN]
If someone is in a jam, they are in a very difficult situation.
[informal]
They were in a real jam, Bob thought glumly.
9. verb
When jazz or rock musicians are jamming, they are informally playing music that has not been written down or planned in advance.
[informal]
He was jamming with his saxophone. [VERB]
Jam is also a noun.
...a free-form jazz jam.
...a jam session.
10. See also traffic jam
More Synonyms of jam
jam in British English1
(dʒæm)
verbWord forms: jams, jamming or jammed
1. (transitive)
to cram or wedge into or against something
to jam paper into an incinerator
2. (transitive)
to crowd or pack
cars jammed the roads
3.
to make or become stuck or locked
the switch has jammed
4. (transitive; often foll byon)
to activate suddenly (esp in the phrase jam on the brakes)
5. (transitive)
to block; congest
to jam the drain with rubbish
6. (transitive)
to crush, bruise, or squeeze; smash
7. radio
to prevent the clear reception of (radio communications or radar signals) by transmitting other signals on the same frequency
8. (intransitive) slang
to play in a jam session
noun
9.
a crowd or congestion in a confined space
a traffic jam
10.
the act of jamming or the state of being jammed
11. informal
a difficult situation; predicament
to help a friend out of a jam
12. jam session
Derived forms
jammer (ˈjammer)
noun
Word origin
C18: probably of imitative origin; compare champ1
jam in British English2
(dʒæm)
noun
1.
a preserve containing fruit, which has been boiled with sugar until the mixture sets
2. slang
something desirable
you want jam on it
3. jam today
Word origin
C18: perhaps from jam1 (the act of squeezing)
Jam. in British English
abbreviation for
1.
Jamaica
2. Bible
James
Jam in American English
Jamaica
jam in American English1
(dʒæm)
verb transitiveWord forms: jammed or ˈjamming
1.
to squeeze or wedge into or through a confined space
2.
a.
to bruise or crush
b.
to force (a thumb, toe, etc.) back against its joint so as to cause impaction
3.
to push, shove, or crowd
4.
to pack full or tight
5.
to fill or block (a passageway, river, etc.) by crowding or squeezing in
6.
a.
to wedge or make stick to prevent movement
b.
to put out of order by such jamming
to jam a rifle
7.
to make (radio broadcasts, radar signals, etc.) unintelligible, as by sending out other signals on the same wavelength
8. US, Basketball; Slang
stuff (sense 20)
verb intransitive
9.
a.
to become wedged or stuck fast
b.
to become unworkable through such jamming of parts
10.
to push against one another in a confined space
11. US, Informal
to improvise freely, esp. in a jam session
noun
12.
a jamming or being jammed
13.
a group of persons or things so close together as to jam a passageway, etc.
a traffic jam
14. US, Informal
a difficult situation; predicament
15. US, Informal
jam session
16. US, Basketball; Slang
stuff (sense 11)
jam in American English2
(dʒæm)
noun
a food made by boiling fruit with sugar to a thick mixture