oyasumi kudasai
phrasegood night
osewa ni natte imasu
phraseI am in your care
osewa ni narimasu
phraseto be in someone's care
o-genki-desu-ka
phrasehow are you
onīsan ni sōdan suru
phraseconsult an older brother
onīchan ko
nounolder brother's child
omae
pronounyou (informal, often used by males or in casual settings)
okaeri
interjectionwelcome home
okaerinasai
phrasewelcome back
o nochi ni douzo
phraseafter you
o-kotowari-shimasu
verbto politely decline or refuse
otsukare
interjectionyou've worked hard