一马平川 Traditional form: 一馬平川 Pinyin (reading): yīmǎpíngchuān Definitions: flat land one could gallop straight across (idiom); wide expanse of flat country Characters: 一 - one; a, an; alone 马 - horse; surname 平 - flat, level, even; peaceful 川 - stream, river Traditional characters: 一 - one; a, an; alone 馬 - horse; surname 平 - flat, level, even; peaceful 川 - stream, river