balk
Cross references: 1. frustrate 1. balk \'bo.k\ n [ME balke, fr. OE balca; akin to OHG balko beam, L fulcire] to prop, Gk phalanx log, phalanx 1: a ridge of land left unplowed as a dividing line or through carelessness 2: BEAM, RAFTER 3: HINDRANCE, CHECK 4a: the space behind the balkline on a billiard table 4b: any of the outside divisions made by the balklines 5: failure of a player to complete a motion begun; esp : an illegal motion of the pitcher in baseball while in position 2. balk vt archaic 1: to pass over or by 2: to check or stop by or as if by an obstacle : BLOCK 1: to stop short and refuse to go 2: to refuse abruptly - used with at 3: to commit a balk in sports - balk.er n
Webster's English Dictionary