[] () the activity of buying particular shares after obtaining secret information that sb is about to buy a large number of them, which will probably make their value rise行头盘，扒头交易（在得到某人将大量购买某些股票的秘密消息时加入到购买行列中，这将导致股票升值）ⓘ Front-running is usually illegal.扒头交易通常是非法的。