(p. pr. & vb. n.) of Thwart.

annulment bafflement balk balking buck-passing cancellation check checkmate circumvention confounding counterbalancing defeat discomfiture disconcertion elusion evasion foil foiling frustration getting around getting round invalidation neutralization nullification offsetting outguessing outmaneuvering outwitting passing the buck the runaround the slip undoing upset vitiation voiding