What is the meaning of underestimate?

noun

• An estimation that is too low; an estimate that is less than the true or actual value.
  • synonyms: underestimation, underrating, underreckoning

verb

• Assign too low a value to.
  • usage: "Don't underestimate the value of this heirloom-you may sell it at a good price"
  • synonyms: undervalue
• Make a deliberately low estimate.
  • usage: "The construction company wanted the contract badly and lowballed"
  • synonyms: lowball
• Make too low an estimate of.
  • usage: "he underestimated the work that went into the renovation"; "Don't underestimate the danger of such a raft trip on this river"
  • synonyms: underrate