(I'M) GLAD YOU COULD DROP BY.
(I'm) glad you could drop by.: translation
(I'm) glad you could drop by. & (We're) glad you could drop by. & (I'm) glad you could stop by. & (We're) glad you could stop by.
a phrase said by the host or hostess (or both) to a guest who has appeared suddenly or has come for only a short visit. •
Tom: Good-bye. Had a nice time. Mary: Thank you for coming, Tom. Glad you could drop by.
•
Tom: Thank you so much for having me. Sally: We're glad you could drop by.