dirty tricks

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Also see: tricks

Concise Oxford English Dictionary © 2008 Oxford University Press:
dirty/ˈdɜːti/

▶adjective (dirtier, dirtiest)

• 1 covered or marked with a substance that causes a mark, stain, or contamination; not clean.

  ■ (of a nuclear weapon) producing considerable radioactive fallout.

• 2 lewd; obscene.

• 3 dishonest; dishonourable.

• 4 (of weather) rough and stormy.

▶adverb Brit. informal very: a dirty great stone. ▶verb (dirties, dirtying, dirtied) make dirty.

– phrases
do the dirty on Brit. informal cheat or betray.
get one's hands dirty (or dirty one's hands) do manual, menial, or other hard work.
play dirty informal act in a dishonest or unfair way.

– derivatives
dirtily adverb,
dirtiness noun.