foul

Entry Definition
s/he hits h/ with glancing blow, grazes h/; (baseball) s/he ticks h/ foul (ball)
s/he talks dirty, uses foul language
s/he habitually talks dirty, uses foul language, swears
s/he has foul mouth, talks dirty
s/he fouls it up by tinkering with it
s/he fouls up something belonging to h/ by tinkering with it
s/he messes it up for h/, fouls up something belonging to h/