a calculation that results in an estimate that is too low
make too low an estimate of; "he underestimated the cost"
assign too low a value to
an estimation that is too low; an estimate that is less than the true or actual value
make too low an estimate of; "he underestimated the work that went into the renovation"; "Don''t underestimate the danger of such a raft trip on this river"
make a deliberately low estimate; "The construction company wanted the contract badly and lowballed"
assign too low a value to; "Don''t underestimate the value of this heirlooom-you may sell it at a good price"