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"
a garment similar to a jacket that is used to bind the arms tightly against the body as a means of restraining a violent person
anything immaterial that severely hinders or confines; "they defected because Russian dance was in a straitjacket"; "the government is operating in an economic straitjacket"