'phral du

འཕྲལ་དུ
at once, immediately [IW]

instantly [RY]

at once, immediately, quickly, suddenly, "as soon as" clause connective, for use before verbs [JV]

'phral gyi immediate(ly) [RB]

immediately [RY]

at first [RY]

at once, straight away, promptly [RY]

at once, immediately, quickly, suddenly, "as soon as" clause connective, for use before verbs, at a given moment [JV]