tipster; tout
A person who sells betting tips, especially in horse racing or other gambling contexts. Often carries a slightly shady or street-level connotation.
I was approached by a tipster near the racetrack.
That tipster's predictions seem to be accurate.
Standard kanji-katakana spelling.
Full-width katakana spelling; rarely used in practice but included for search coverage.
Compound of コーチ (from English 'coach', here meaning a tip or advice in gambling contexts) and 屋 (a suffix for a shop or person engaged in a trade).