隠さないで

don't hide, don't keep secret

→ 隠す
隠さ hide, conceal + ない Negation + で Te-form (conjunctive)
verb · informal Rare #38,468
don't hide, don't keep secret A request not to hide something; the tone depends on the surrounding words.
JA: 私に何も隠さないで。
EN: Don't hide anything from me.
Conjugation of 隠す
Imperative
隠さないで隠せ

隠さないで話してくれ。

Don't hold anything back—talk to me.

その事を僕に隠さないでください。

Please don't hide that from me.

では現場にいた人や怪物と接触した人は全員手を上げて隠さないでくださいよ

Now, everyone who was at the scene or came into contact with the monster, raise your hands—don’t hide it.

— グエムル -漢江の怪物- (2006)

隠さないでくれ

Don't hide it from me.

— さらば、わが愛/覇王別姫 (1993)

ベッドの下に隠さないでよ。

Don’t hide it under the bed.