adjective
    
    fouler; -est
    
    [or more ~; most ~]
    
    very unpleasant to taste or smell
    
    
    
    
    
    
    
    
    
    morally bad :very evil
    
    
    
    very bad or unpleasant
    
    
    
    
    
    
    
    indecent and offensive
    
    
    
    
    
    very unfair :not morally or socially acceptable
    
    
    
    baseball :outside the area between the foul lines
    
    
    
    
    
    A foul ball is a batted ball that lands in the area outside the foul lines. - compare 1fair
    
    fall foul of
    
    to get into trouble because of (the law, a rule, etc.)
    
    
    
    
    
    noun
    
    plural fouls
    
    [count] sports :an action that is against the rules and for which a player is given a penalty
    
    
    
    
    
    baseball :a batted ball that lands outside the foul lines :a foul ball
    
    
    
    cry foul
    
    
    
    verb
    
    fouls; fouled; fouling
    
    [+ obj] :to make (a substance, place, etc.) dirty
    
    
    
    
    
    sports
    
    [no obj] :to commit a foul
    
    
    
    [+ obj] :to commit a foul against (another player)
    
    
    
    
    
    [+ obj] baseball :to hit (a pitched ball) so that it lands outside the foul lines
    
    
    
    
    
    [+ obj] :to become twisted around (something) so that it cannot move, be used, etc.
    
    
    
    foul out
    
    [phrasal verb]
    
    basketball :to be forced to leave a game because you have made too many fouls
    
    
    
    baseball of a batter :to make an out by hitting a foul fly ball ball that is caught by a fielder
    
    
    
    foul up
    
    [phrasal verb] informal
    
    foul (something) up :to ruin or spoil (something)
    
    
    
    
    
    foul up :to make mistakes :to fail at something because you have made a mistake or been careless