Crossword puzzle clue "flunking a polygraph"

Here are the possible solutions for flunking a polygraph clue

Answer
Clue
Relevancy
lying
Clue
Flunking a polygraph
Flunking a polygraph?
Definition
untruthful
aces
Clue
Doesn't come close to flunking
Definition
ACE, to serve an unreturnable shot e.g. in tennis
effs
Clue
Flunking marks
Definition
EFF, euphemism for fuck
efs
Clue
Flunking letters
Flunking grades
Definition
EF, the letter F
pass
Clue
Avoid flunking
Definition
to go by
passed
Clue
Avoided flunking
Definition
PASS, to go by

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