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信手:随手;拈:用手指捏取东西。随手拿来。多指写文章时能自由纯熟的选用词语或应用典故,用不着怎么思考。
[toss;pick up at random;have words,materials etc.at one's fingertips and write with facility] 随手取来。形容写文章等时词汇或材料丰富,能熟练运用 信手拈来尽可惊。——宋· 陆游《秋风亭拜寇莱公遗像》