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Make eye contact. Repeat after him. Utilize the power of touch. Challenge him. Give him an opportunity to approach you.
Once your eyes do meet his, you also need to show him a smile. Eye contact lets a man know that you're interested in him, but the smile is what lets him know that your interest is a positive one.  To maximize the effect further, start by making a few sidelong glances in his direction. After a couple of these, look at him directly. As soon as he looks back, though, lower your eyes and show a coy, embarrassed smile. Slowly drag your eyes back up to his after a few moments. Continue to smile. Break eye contact and look away completely for a few minutes. Repeat the process again, as needed, to convey your interest. Mimic his body language. When he sips from his drink, sip from yours. If he tilts his head, tilt yours, too. Your behavior can relate to his without directly repeating it. For example, if he gets another drink and your glass is still full, hold up your glass in a quick "cheers" pose before taking a sip. Doing so acknowledges his action and clues him into the fact that you're paying attention. When women are interested in a man, they naturally begin to play with their hair and touch themselves in other similar ways. You can use these types of actions to indirectly convey your interest to a man.  Play with your hair. Twirl in between your fingers or run your fingers through it in an absent-minded manner. Run your fingers over your neck and shoulders. Wet or nibble on your lips, but try not to be obvious about it. If the man you have your eye on still hasn't made a move, take a step back and give him the chance to chase after you. After making your interest obvious for a few minutes, stop and act like your interest is declining. Let a few more minutes pass by before turning his way again. Don't look busy. If a man thinks that you're waiting for someone or preoccupied by something else, he's less likely to look your way.  In fact, it can be a good idea to look bored—when you're not looking at him, of course. Play around with a pen or glass. Keep your attention off your phone and out of a book. Look around idly and without focusing on much of anything. Some men might need a little more encouragement. Give him the opportunity to talk to you by positioning yourself closer and standing alone. Walk by him on your way to the restroom or bar. You can even lightly bump shoulders with him and apologize with a coy grin.