From WordNet (r) 3.0 (2006):
baulk
n 1: the area on a billiard table behind the balkline; "a player
with ball in hand must play from the balk" [syn: balk,
baulk]
2: something immaterial that interferes with or delays action or
progress [syn: hindrance, hinderance, deterrent,
impediment, balk, baulk, check, handicap]
3: one of several parallel sloping beams that support a roof
[syn: rafter, balk, baulk]
v 1: refuse to comply [syn: resist, balk, baulk, jib]