v.扩散，变宽，向外鼓出[裂开]，使逐渐向上收缩...

flanch的音标：flanch的英式发音音标为：[flæntʃ]flanch的美式发音音标为：[flæntʃ]...

The sides of the boat flanch ed outwards.船身朝外鼓出....