[n] an illegal pitching motion while runners are on base
[n] one of several parallel sloping beams that support a roof
[n] something immaterial that interferes with or delays action or progress
[n] the area on a billiard table behind the balkline; "a player with ball in hand must play from the balk"
[v] refuse to comply
baulk, baulk, baulk, baulk, check, deterrent, handicap, hindrance, impediment, jib, rafter, resist