いってらっしゃい (Itterasshai) means "Have a good trip," "Take care," or "See you when you get back." It's said to someone who is leaving home or a workplace, expressing good wishes for their safe return. It's a common phrase within families and close circles.

家や職場を出かける人に対して、「気をつけて行ってきてね」という気持ちを込めて言う挨拶です。