set cap for
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set (one's) cap for (someone)
dated To try to attract, secure, or win someone as a romantic partner or spouse. (Said especially (though not exclusively) of a woman in pursuit of a bachelor.) Well, if he insists on remaining so inhospitable, then I shall simply set my cap for a man with a greater sense of charm and decency. The ladies of this town shall all be setting their caps for Mr. Rutherford, now that his inheritance has left him quite wealthy. Don't you find it rather unseemly for a man of his age and station to set his cap for a girl who's barely of voting age?
set (one's) cap for
To attempt to attract and win as a mate.
set one's cap for, to
To pursue someone as a potential mate. This term dates from the eighteenth century, and although at least one writer believes it refers to ladies choosing their most becoming headgear in order to attract gentlemen, it was originally applied to both sexes. By the early nineteenth century, however, it was used mostly for females chasing males, as in Byron’s Don Juan of 1832 (“Some who once set their caps at cautious dukes”) and Thackeray’s Vanity Fair of 1848 (“Have a care, Joe; that girl is setting her cap at you”). Shirlee Emmons’s biography of Lauritz Melchior (Tristanissimo, 1990) says Melchior’s children believed “that Kleinchen deliberately set her cap for this young man who lived alone and far from his family.”