Related Clues:

• Send a message in it, extraordinarily
• Make a travel reservation
• Reserve on all sides today
• Sentry left stony broke and the author is responsible for this
• Reach out with one's hands?
• Travel website button
• Many a phone message nowadays
• Reason for a phone notification
• Write with your thumbs
• 'The most powerful drug used by mankind': Rudyard Kipling
• Many a smartphone message
• Literary analysis target
• WhatsApp message
• Arm first to back an argument
• Message with emojis, maybe