Out of touch(idiom)
To no longer have recent knowledge or information about something.
Hindi meaning:जानकारी की कमी होना
Synonyms: Ignorant, Insensible, Oblivious, Unaware, Unfamiliar With, Unknowledgeable
Antonyms: Informed, Enlightened, Knowledgeable, Learned, Expert, Acquainted
Example: I couldn't go back into mechanics because I've been out of touch for too long.
Trick to remember: Touch nhi ho rhi bol out of touch hai 
