—v.t. 1. to sell more of (a stock, product, etc.) than can be delivered.
2. to sell aggressively, as by using high-pressure merchandising techniques.
3. to emphasize the good points of excessively and to a self-defeating extent: She so oversold the picnic that I became convinced I'd have a better time at the movies.
—v.i. 1. to sell something aggressively.
2. to make extreme claims for something or someone.