何しに

what ... for

→ 何
phrase Uncommon #15,705
what ... for Used to ask the purpose of going, coming, or doing something.
JA: ここに何しに来たの?
EN: What did you come here for?

何しに帰ってきたの

What did you come back for?

— マルホランド・ドライブ (2001)

何しに来たんだ?

What did you come here for?

— High and Low (1963)

うちに何しに来やがった

What the hell did you come to my house for?

— Tampopo (1985)

一体何しに戻ってきたんだメアリー?

What on earth did you come back for, Mary?

— 罪人たち (2025)

トムは何しにそこに行ったの?

What did Tom go there for?

知ってる人でも…何しに行く

Even if it’s someone I know… what would I go there for?

— タクシー運転手 約束は海を越えて (2017)

何しに来たんだ

What did you come here for?

— ブレット・トレイン (2022)

日本に何しに行くの?

What are you going to Japan for?

何しに戻ってきたの?

What did you come back for?

— 罪人たち (2025)

地球からマルカムさんへ今度は何しに来たんだ、ピート?

From Earth to Mr. Malcolm: What have you come here for this time, Pete?

— ミスティック・リバー (2003)