expression
please sit down; please have a seat
Polite request used when offering a seat to someone. Often heard in formal settings or when welcoming guests.
どうぞ、おかけ下さい。
Please, have a seat.
お客様、こちらへおかけ下さい。
Please sit over here, sir/madam.
Plain verb meaning 'to sit'. おかけ下さい is a polite request form, while 座る is the basic action.
Another polite way to say 'please sit down', using 座る. おかけ下さい is slightly more formal and common in service contexts.
Polite request form of the verb 掛ける (かける, 'to sit') with honorific prefix お and 下さい (ください, 'please').