1.To engage in contradiction; to be in opposition. (Obs.) "In strifeful terms with him to balk."
2.To stop abruptly and stand still obstinately; to jib; to stop short; to swerve; as, the horse balks. Note: This has been regarded as an Americanism, but it occurs in Spenser's "Faerie Queene," Book IV., 10, xxv. "Ne ever ought but of their true loves talkt, Ne ever for rebuke or blame of any balkt."
3.(Baseball) To commit a balk (6); of a pitcher.