to be unfaithful to your partner
パートナーに不誠実である (pa-tona- ni fuseijitsu de aru)
"She found out that her boyfriend had cheated on her."
"彼女は彼氏が彼女を裏切ったことを知った。" (kanojo wa kareshi ga kanojo o uragitta koto o shitta.)
to investigate or explore potential collaborations
to improve the appearance of something slightly, like makeup...
to do something easily and confidently
to become familiar or comfortable with something
to recover and continue after facing difficulties or failure...
to introduce taxes on imported goods