Dirty tricks and Secret plan

Dirty tricks noun - Underhand commercial or political behavior designed to discredit an opponent.

Secret plan and dirty tricks are semantically related. In some cases you can use "Secret plan" instead a noun phrase "Dirty tricks".

Secret plan noun - A secret scheme to do something (especially something underhand or illegal).

Dirty tricks and secret plan are semantically related. Sometimes you can use "Dirty tricks" instead a noun phrase "Secret plan".