Tuesdays
Tuesdays (adv) means On Tuesday, or every Tuesday, as a regular habit. Example: “The market is only open Tuesdays and Saturdays.”
How to use Tuesdays
Learner’s notesIn plain EnglishUsed to describe something that happens regularly on that day, rather than on one specific Tuesday.
Use "on Tuesday" for a single occasion but "Tuesdays" (no "on") for a recurring habit — "I go swimming Tuesdays."
Fill the gap
Can you complete this real example?
The market is only open _____ and Saturdays.
Etymology
Formed by adding the adverbial -s to Tuesday, the same pattern seen in "Sundays" or "weekdays."