If you psych out your opponent in a contest, you try to make them feel less confident by behaving in a very confident or aggressive way. They are like heavyweight boxers, trying to psych each other out and build themselves up
psych out
Turkish pronunciation
sayk aut
Pronunciation
/ˈsīk ˈout/ /ˈsaɪk ˈaʊt/
Etymology
() Recorded since 1934; from psych (short for psychology) + out