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"
give or bring back; "Restore the stolen painting to its rightful owner"
bring back into original existence, use, function, or position; "restore law and order"; "reestablish peace in the region"; "restore the emperor to the throne"
return to its original or usable and functioning condition; "restore the forest to its original pristine condition"