play false is a verb meaning "conceal one's true motives from especially by elaborately feigning good intentions so as to gain an end". It carries one recorded sense.
conceal one's true motives from especially by elaborately feigning good intentions so as to gain an end
“He bamboozled his professors into thinking that he knew the subject well”
Definitions, synonyms and semantic relations for play false come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.