Expressions (phrases, clauses, etc.), Interjection (kandoushi)
I'm off (and will be back later); see you later
see 行ってきます
ちょっと郵便局へいってくる。I'm just going to drop by the post office. Expressions (phrases, clauses, etc.), Kuru verb - special class
to go (and then come back)
Also written 行って来る【いってくる】