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in the PONS Dictionary

I. jam2 [dʒæm] N

1. jam inf (awkward situation):

2. jam no pl (crowd):

3. jam (in machine):

4. jam MUS:

II. jam2 <-mm-> [dʒæm] VB trans

1. jam (cause to become stuck):

jam machine, mechanism
jam machine, mechanism

2. jam (cram):

3. jam radio:

III. jam2 <-mm-> [dʒæm] VB intr

1. jam (become stuck):

jam photocopier
jam photocopier

jam jar N

jam-packed [ˌdʒæmˈpækt] ADJ inf

paper jam N

traffic jam N

Present
Ijam
youjam
he/she/itjams
wejam
youjam
theyjam
Past
Ijammed
youjammed
he/she/itjammed
wejammed
youjammed
theyjammed
Present Perfect
Ihavejammed
youhavejammed
he/she/ithasjammed
wehavejammed
youhavejammed
theyhavejammed
Past Perfect
Ihadjammed
youhadjammed
he/she/ithadjammed
wehadjammed
youhadjammed
theyhadjammed