jamming Definition

jam²
verb jammed, jamming

1. To stick or wedge something so as to make it immovable.
tr & intr
2. Said of machinery, etc: to stick or make it stick and stop working.
3. To push or shove something; to cram, press or pack.

Thesaurus: compress, compact, cram, crush, pack, press, sandwich, squash, squeeze.
4. To fill (eg a street) so full that movement comes to a stop.

Form: jam something up (also)
5. To cause interference to (a radio signal, etc), especially deliberately.
intr
6. colloq
To play jazz in a jam session.

Etymology: 18c: probably an imitation of the actions or its sound.