The phrase "controversial penalty" means a decision made by a referee or official in a game or competition that causes disagreement or dispute among people. Full definition
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Rafael Moura put the Brazilians ahead and Fred finished the game off with a highly controversial penalty in the last few minutes. (caughtoffside.com)
Kane, like manager Mauricio Pochettino, praised the officials for having the strength of character to award two controversial penalties at Liverpool's home ground. (newindianexpress.com)