Japanese with Manga

Don't say it with 〜てはだめだ

Manga panel from ご注文はうさぎですか? showing example of Don't say it with 〜てはだめだ.
ご注文はうさぎですか? » Volume 1 » Page 54

Syaro gives a vague account of her first meeting Rize, as the truth is too embarassing for her. When Cocoa misunderstands the event, Rize prepares to tell what really happened.

シャロ:
「あっ()ちゃだめです!」
“Ah, don't say it!”

Note that ちゃ is a casual spoken variation of ては.

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