someone, especially a gambler, who pretends to be important but actually has little money, influence, or skill.
cheap and insignificant; small-time: a tinhorn racket.
Origin of tinhorn
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
a cheap pretentious person, esp a gambler with extravagant claims
cheap and showy
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Online Etymology Dictionary, © 2010 Douglas Harper