予よ想そう屋や

noun

tipster; tout

A person who sells predictions or tips, most commonly associated with horse racing, but also used for other gambling or speculative contexts.

• 競けい馬ば場じょうの近ちかくに予よ想そう屋やが店みせを構かまえている。

  A tipster has set up shop near the racetrack.

• 彼かれは予よ想そう屋やから買かった情じょう報ほうで馬ば券けんを買かった。

  He bought a betting ticket based on information he got from a tipster.