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"
escape potentially unpleasant consequences; get away with a forbidden action; "She gets away with murder!"; "I couldn't get out from under these responsibilities"
cause to be acquitted; get off the hook; in a legal case; "The lawyer got him off, even though there was no doubt in everybody's mind that he killed his wife"
deliver verbally; "He got off the best line I've heard in a long time"