Related Clues:

• In the know about
• Aware of
• Familiar with
• Aware of, slangily
• In on
• Savvy about
• Well aware of
• Informed about
• Aware of, to cool cats
• Clued in about
• Up on
• In on, slangily
• Huey Lewis and the News tune, "___ Be Square"
• Conscious of
• Aware of, so to speak