to talk in a friendly, informal way
During lunch break, the employees chat about their weekend plans near the coffee machine.
Grandpa loves to chat with the neighbors while watering his garden.
✦ From Old French ‘chater’ meaning ‘to chatter, gossip’; echoic of rapid talking.
to exchange written messages instantly over the internet
I chat with my friends online every evening after dinner.
She chatted with the customer support agent through the website’s help window.
