balk balk /ˈbɑːlk/

noun

1. An illegal pitching motion while runners are on base  ( balk )
   an illegal pitching motion while runners are on base
   
2. One of several parallel sloping beams that support a roof  ( balk , baulk [British] , rafter )
   one of several parallel sloping beams that support a roof
    The rafters provide support for the roof of the building
   The rafters provide support for the roof of the building
   
   
3. Something immaterial that interferes with or delays action or progress  ( balk , baulk , check , deterrent , handicap , hinderance , hindrance , impediment )
   something immaterial that interferes with or delays action or progress
   
4. The area on a billiard table behind the balkline  ( balk , baulk [British] )
   the area on a billiard table behind the balkline
    A player with ball in hand must play from the balk
   a player with ball in hand must play from the balk
   

verb

1. () Refuse to comply  ( baulk , jib , resist , balk )
   refuse to comply
     Despite his initial enthusiasm, John baulked at the idea of bungee jumping when he reached the edge of the bridge.
   Despite his initial enthusiasm, John baulked at the idea of bungee jumping when he reached the edge of the bridge.