The grey tick on WhatsApp is a symbol that indicates whether your message has been sent or not. A single grey tick mark on WhatsApp indicates that the message has been sent successfully to the server. A double grey tick mark indicates that the message has been delivered to the recipient’s device.
The grey tick on WhatsApp is different from the blue tick, which indicates that the message has been delivered and read by the recipient. This means that the recipient has received the message and it has been successfully downloaded to their device.
In some cases, the single grey tick can also indicate that the recipient has blocked you on WhatsApp. If you see a grey tick next to a message you sent to a contact, and you are unable to see the double grey tick mark or blue tick after a while, it may mean that the contact has blocked you or else their internet connection is down.