कभी कबार - Once in a blue moon
She comes here once in a blue moon.
अच्छी हालत में या अवस्था में - In the pink
He is in the pink now.
बहुत खर्चीला - white elephant
This mobile is a white elephant for me.
नौसिखिया - green horn
He is a greenhorn.
महत्त्वपूर्ण दिन - A red letter day
26th January is a red letter day for us.