snap-on en · ADJ
Meanings
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(not-comparable) Denoting a cover or attachment that is attached or secured with a snap; able to be attached or detached quickly and easily.
The tin is 6½ in. high and 4 in. in diameter, and has a domed snap-on lid with knob; it will hold 1 lb. of toffees.
1960 June 14, “A Railway Toffee Tin”, in Railway Magazine, page 398: