jam
squeeze or pack tightly into a specified space
become or make unable to move or work due to a part seizing up or becoming stuck
improvise with other musicians, especially in jazz or blues
an instance of a thing seizing or becoming stuck
an awkward situation or predicament
an improvised performance by a group of musicians, especially in jazz or blues.
a sweet spread or conserve made from fruit and sugar boiled to a thick consistency
make (fruit) into jam.
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definition by Oxford Dictionaries