1[countable]a round glass container, with a lid, used for storing food, especially jam, honey, etca storage jar see also jam jar2[countable]a jar and what it containsa jar of coffee3[countable]a tall container with a wide mouth, with or without handles, used in the past for carrying water, etca water jar see also bell jar4[countable] (British English, informal) a glass of beerDo you fancy a jar after work?5[singular]an unpleasant shock, especially from two things being suddenly shaken or hitThe fall gave him a nasty jar.
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