kasam se when used alone means 'I swear' in general. kasam - swear, may be oath. Bus/bas/ बस- may mean stop or enough, or a sense that stop it is enough

the word "bas" can mean two things depending on the context: it can mean "stop/enough" and also it can mean "only". "kasam se" means "i swear" and is used by people usually to offer assurance or while admiring something. hope that helps! =)

bus has many uses in Hindi. bus means enough /stop now /thats all /only /just depending on the context. bus karo = stop that. bus bus= no more please bus itna hi likha hai= only this much is written. bus paas hi hai= its just nearby one more thing bus is also the bus (transport)of English in conversational Hindi. kasam se = swear or oath