dirty pool

Nghĩa (Tiếng Anh)

Foul play, misconduct, underhandedness.

Từ đồng nghĩa

chicanery

crookedness

dishonesty

insincerity

mendacity

shabbiness

unfairness

unjustness

Từ nguyên (Tiếng Anh)

Probably an allusion to failing to follow the rules when playing billiards. Compare not cricket.