by a long shot

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long shot

1. An entry, as in a horserace, with only a slight chance of winning.
a. A bet made at great odds.
b. A venture that offers a great reward if successful but has very little chance of success.
3. A photograph or a movie shot in which the subject appears small or distant in relation to the rest of the image.
by a long shot Informal
To any extent; at all. Usually used in negative sentences: You haven't done your share of the work by a long shot.
ThesaurusAntonymsRelated WordsSynonymsLegend: a long shot - by a great deal; "he is the best by a long shot"; "his labors haven't ended there--not by a long shot"