sit at

sit at something

to be seated in front of something, such as a table. He sat at the table, taking his tea. Please sit at your desk and finish your work before taking a break.
See also: sit
References in classic literature ?
Poyser, as is th' oldest man i' the room, should sit at top o' the table.
Poyser, "suppose we say the man wi' the foulest land shall sit at top; then whoever gets th' honour, there'll be no envying on him.
Why, the broadest man," said Bartle; "and then he won't take up other folks' room; and the next broadest must sit at bottom.