1. actions which are not fair or honest.

A virus wiped out all our computer-held records. We suspect foul play on the part of an ex-employee.

2. murder.

It's not clear why the man drowned, but the police haven't ruled out foul play.

• have a mind of its own
• have a minute to call own
• have a minute to call your own
• have a monopoly on
• have a monopoly on something
• have an ace up sleeve
• have an ace up your sleeve
• have an axe to grind
• have an ax to grind
• have an ear for
• have an ear for something
• have an eye for
• have an eye for something
• have an eye for the main chance
• have an eye on the main chance
• have an open mind
• have a nose
• have a nose for
• have a nose for something
• have a nose round
• have another think
• have another think coming
• have ants in pants
• have ants in your pants
• have a one-track mind