long time no see

/L AO1 NG T AY0 M N OW0 S IY0/
interjection
  1. 1

    I (or we) have not seen you for a long time.

    โ€œDave! Long time no see! Howโ€™s Boston been treating you?โ€

Source: https://en.wiktionary.org/wiki/long%20time%20no%20see