lowball

When you lowball someone, you attempt to buy something from them by offering a lot less money than it's actually worth. If you want to buy a car that you can't quite afford, you might decide to lowball.

Whether you estimate something's value, make an offer to buy something, or try to hire a worker for a very small salary, you lowball. The word works as an adjective too: "He was selling fancy lemonade for two dollars a cup, but I made him a lowball offer, since I only had a quarter in my pocket." This informal slang word was coined in the US, from a railroad term.

Definitions of lowball
1

v make a deliberately low estimate

“The construction company wanted the contract badly and lowballed
Synonyms:
underestimate
Type of:
approximate, estimate, gauge, guess, judge
judge tentatively or form an estimate of (quantities or time)

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