1. traveling at high speed, especially in a train or vehicle
Usage: informal; railroad terminology
2. making an unrealistically high estimate or bid
Usage: business; informal

Examples

• The freight train was highballing through the countryside at maximum speed.
• The engineer kept highballing despite the approaching station.
• The contractor was clearly highballing the renovation costs.
• Stop highballing the price and give me a realistic estimate.
• The locomotive came highballing down the track with its whistle blowing.
• They accused the appraiser of highballing the property value.
• The express train was highballing toward the city.