I owe you one.

What does “I owe you one” mean?

Thanks for helping me; I'll help you in return some day.

• It'll pass./ɪtl pæs/
• I wasn't born yesterday./aɪ ˈwʌznt bɔːrn ˈjestərdeɪ/
• Talk is cheap./tɔːk ɪz tʃiːp/
• I got your back./aɪ ɡɑːt jʊr bæk/
• Talk to the hand./tɔːk tuː ðə hænd/
• No money, no honey./noʊ ˈmʌni noʊ ˈhʌni/
• Wish me luck./wɪʃ mi lʌk/
• Live long and prosper./lɪv lɔːŋ ənd ˈprɑːspər/