いかないで

don't leave behind, don't go away

→ 行く
いか to go + ない Negation + で Te-form (conjunctive)
auxiliary · informal Rare #41,149
don't leave behind, don't go away Used after a verb's te-form to ask someone not to go while doing that action, often leaving someone or something behind.
JA: 私を置いていかないで。
EN: Don't leave me behind.
Conjugation of 行く

置いていかないで。

Don't leave me behind.

さようならも言わずに出ていかないで下さい。

Please don't leave without saying goodbye.

置いていかないで!

Don't leave me behind!

— Demon Slayer -Kimetsu no Yaiba- The Movie: Mugen Train (2020)