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胸有成竹，漢語成語，本意是指「在文藝創作開始前，藝術形象已在頭腦中生成（have an image of the art in one’s mind prior to artistic creation）」。後比喻在做事之前已經拿定主意，有自信，可以翻譯為「have had ready plans [designs] in one's mind；with complete confidence」。
例句：
所有的答案他都胸有成竹。He had all the answers off pat.
她對自己的立場不再胸有成竹。She was no longer sure of her position.
Editor: Jade
來源：chinadaily.com.cn