くれば

if ... comes

→ 来る

くれ come + ば Conditional (if/when)

auxiliary · conditional Rare #28,277

if ... comes As an auxiliary, it follows the て-form of another verb in 〜てくれば, meaning “if someone does something and comes (back).”

JA: お土産を買ってくれば、みんなで食べましょう。

EN: If you buy a souvenir and bring it back, let’s all eat it together.

Conjugation of 来る

Conditional

Then go ahead and go.

— ブエノスアイレス (1997)

We should have bought another bottle of wine.

Bring him back dead, and there’s a reward.

— RRR (2022)

I should have worn one more layer.

If you go for a short walk, you’ll probably enjoy your breakfast more.

Why don't you go and see for yourself?