To fall asleep very quickly or to lose consciousness suddenly
अचानक सो जाना या बेहोश हो जाना
English Usage: After a long day at work, he was out like a light as soon as his head hit the pillow.
Hindi Usage: काम के लंबे दिन के बाद, उसका सिर तकिए पर रखते ही वह तुरंत सो गया।
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