Don't breathe a word.
一言も漏らすな
Don't bring me down.
落ち込ませないで
Don't carry much money with [about] you.
大金を持ち歩くな
Don't clutter your desk up.
机の上を散らかすな
Don't come the sister [the innocent] with me.
姉さん風吹かせないで［純情ぶったりするな］（◆the sister [the innocent]は主格補語）
Don't come unless I tell you to.
来いと言わない限り来るな
Don't concern yourself about the future.
先のことなど気にするな
Don't cop an attitude.
態度悪いぞ
Don't count your chickens (before they are hatched).
((諺))取らぬ狸たぬきの皮算用
Don't cry.
泣かないで
