1. to keep one's eyes open, watch out, be wary, be on guard. 2. to enlighten (someone), open (someone's) eyes. 3. to be enlightened. 4. to take (a virgin) to bed. 5. to have intercourse for the first time (with)
1. to inform (someone) about sex, teach (someone) about the birds and the bees, clue (someone) in on what sex is all about. 2. to cause (someone) to begin to understand what the world is really like