jam
UK[dʒæm]US[dʒæm]
v
To push something somewhere with a lot of force, or to become stuck in a position
v
To fill a place completely so that movement is difficult or impossible
v
To make a machine or device stop working by causing a part to become stuck
n
A sweet food made by boiling fruit with sugar until it is thick
n
A situation where people or vehicles are so close together that movement is difficult or impossible
n
An informal performance by musicians playing together, especially in jazz or rock
Etymology
The word 'jam' first appeared in English in the early 18th century, primarily as a verb meaning 'to press or squeeze tightly'. Its exact origin is obscure, but it is widely considered to be onomatopoeic, possibly imitating the sound of something being crushed or forced together. This core sense of forceful compression logically extended to describe traffic congestion, radio interference, and the act of musicians improvising together in a tightly coordinated session. The noun for the fruit preserve, first recorded in the mid-18th century, is unrelated etymologically; it likely derives from the verb 'jam', referring to the fruit being 'jammed' or crushed together in the pot, or possibly from the childish syllable 'jam' used for something sweet.
Analysis
The word 'jam' is a simplex word of uncertain but likely onomatopoeic origin. It does not contain separable, meaningful morphemes within its modern English spelling.
Examples
He tried to jam all his clothes into one small suitcase.
We were stuck in a traffic jam for over an hour.
She spread strawberry jam on her toast.