"balk" in the noun sense
1. balk, baulk
the area on a billiard table behind the balkline
"a player with ball in hand must play from the balk"
2. hindrance, hinderance, deterrent, impediment, balk, baulk, check, handicap
something immaterial that interferes with or delays action or progress
3. rafter, balk, baulk
one of several parallel sloping beams that support a roof
4. balk
an illegal pitching motion while runners are on base
"balk" in the verb sense
1. resist, balk, baulk, jib
refuse to comply
Source: WordNet® (An amazing lexical database of English)
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