tab noun definition in Dining out topic from the Oxford Advanced Learner's Dictionary

tab

 noun: Dining out topic
a bill for goods you receive but pay for later, especially for food or drinks in a restaurant or bar; the price or cost of something a bar tab Can I put it on my tab? The tab for the meeting could be $3 000. Who is going to pick up the tab for the legal expenses? He walked out of the restaurant and left me to pick up the tab for the whole meal.