Possible Clues:

• It's heard on a basketball court
• Offensive lines
• Offensive lines on the field
• Shade on a field
• Taunting banter between players
• Intimidating insults
• Taunts between teams, or an apt description of 16-, 29-, and 48-Across?
• Some attempts at intimidation, in sports
• Comments about someone's mother, say
• Insulting exchange on the field