Definition of obstruction for English Language Learners. : something that blocks something else and makes it difficult for things to move through. : the condition of being blocked so that things cannot move through easily.
The Thrasher. 1. The Thrasher-is a hand gesture with a sexual connotation. The pointer finger and middle are pointing straight up while the thumb is bent like a hook. The ring and index fingers are kept in a fist and the back of the hand faces outwards (away from the gesture).
Word Origin and History for thrash. v. 1580s, to separate grains from wheat, etc., by beating, dialectal variant of threshen (see thresh). Sense of beat (someone) with (or as if with) a flail is first recorded c.1600. Meaning to make wild movements like those of a flail or whip is attested from 1846. Related: Thrashed; thrashing. Type of fast heavy metal music first called by this name 1982.