What does "tab" mean?

See tab in WNW Idioms

keep tabs on

or keep a tab on☆
Informal to keep a check on; follow or watch every move of

pick up the tab

☆
Informal to pay the bill or total cost

See tab in American Heritage Dictionary 4 Idioms

keep tabs on

Informal
To observe carefully: Let's keep tabs on expenditures.

Learn more about tab

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