on the cusp of sth
常用于比喻，表示处于重大变化的临界点。
She stood on the cusp of a new career.
她站在新事业的转折点上。
转折点；临界点
尖端；尖头；牙尖；星座交界；宫位交界；尖瓣（建筑）；瓣尖
A point of transition, especially an important moment when a decision determines future events.
常用于 on the cusp of，表示‘即将进入某种状态/新阶段’。
A sharp point or pointed end.
由两条相交弧线形成的尖点(如哥特式拱门的内弧)
point formed by two intersecting arcs (as from the intrados of a Gothic arch)
An important moment when a decision is made that will determine future events.
心脏瓣膜的薄三角形瓣叶
a thin triangular flap of a heart valve
A point of a curve where the curve is continuous but has no derivative, but such that it has a derivative at every nearby point.
牙齿咀嚼面上的小突起
small elevation on the grinding surface of a tooth
A point made by the intersection of two curved lines or curved structures, a common motif in Gothic architecture.
黄道十二宫与宫位之间的分界。
A boundary between zodiacal signs and houses.
犬齿或臼齿的尖头部分。
Any of the pointed parts of a canine tooth or molar.
心脏或血管瓣膜的瓣叶。
A flap of a valve of a heart or blood vessel.
过渡点。
A point of transition.
The Gothic arch comes to a sharp cusp at the top.
哥特式拱门在顶部形成一个尖锐的尖顶。
用法提示：cusp 作为名词，指拱门顶部由两弧相交形成的尖点。
The star symbol has five pointed cusps.
星形符号有五个尖角。
用法提示：cusps 是 cusp 的复数形式，指星形各顶点突出的尖点。
The curve has a cusp at the origin, where the direction changes abruptly.
该曲线在原点处有一个尖点，方向在此突然改变。
用法提示：cusp 作为名词，指数学曲线上的尖端转折点。
常用于比喻，表示处于重大变化的临界点。
She stood on the cusp of a new career.
她站在新事业的转折点上。
The cusp of the arch was perfectly carved.
拱门的尖顶雕刻得完美无瑕。
用于医学术语，指牙齿的尖端。
The dentist examined the cusp of the molar.
牙医检查了磨牙的牙尖。
常用于 on the verge of，与 on the cusp of 可替换，强调马上就要发生，语气较中性。
较正式，常用 at the threshold of，强调进入新阶段的起点，不像 cusp 那样隐含时间紧迫。
常用于 on the brink of，多指灾难或极端状态的边缘，语气比 cusp 强烈。
强调发展方向出现明显改变的时刻，搭配多为 a turning point (in...)，与 cusp 的介词搭配不同。
多指面临重大选择或人生路口，常用 at a crossroads；侧重决策，cusp 侧重状态转变。
grammar · medium
易错句子The function cusps at x=0.
正确表达The function has a cusp at x=0.
Cusp 是名词，表示‘尖点’，不能用作动词。应使用 have a cusp 或 there is a cusp 等结构。
grammar · medium
易错句子She is at the cusp of a breakthrough.
正确表达She is on the cusp of a breakthrough.
固定搭配介词应为 on，表示‘处于……的边缘/转折点’，而非 at。
grammar · medium
易错句子We stood on the cusp of the mountain.
正确表达We stood on the peak of the mountain.
Cusp 特指曲线或拱门的尖点，不用于描述山峰，应改用 peak 或 summit。
处于……的转折点；即将进入……
The country is on the cusp of a new era.
这个国家正处于一个新时代的转折点。
曲线的尖点
The cusp of the curve is where the direction changes suddenly.
曲线的尖点是方向突然改变的地方。
牙尖；牙齿咀嚼面上的突起
A dental cusp is one of the raised points on the chewing surface of a tooth.
牙尖是牙齿咀嚼表面上的突起之一。
星座交界（出生在相邻两个星座分界附近）
My birthday falls on the astrological cusp between Leo and Virgo.
我的生日落在狮子座与处女座之间的星座交界处。
几何中，尖端可由两段弧相交形成，与cusp的几何义相关。
心脏瓣膜的薄片部分称为cusp，valve是其所在的解剖结构。
臼齿咀嚼面上的突起称为cusp，molar是常见拥有该结构的牙齿。
占星术中cusp指两个星座间的分界，zodiac为其所属体系。
数学中cusp是曲线上的一种特殊点，curve为其语境。
即将……；正处于……的关键时刻
The company is on the cusp of a major breakthrough.
这家公司正处于重大突破的关键时刻。
处在两个时代或两种状态的转换分界点上
Many people born in 1980 are on the cusp between Generation X and Millennials.
很多1980年出生的人处在X世代与千禧一代的分界线上。
即将大获成功；处于腾飞的前夜
The team was on the cusp of greatness when their best player got injured.
球队即将大放异彩时，他们最好的球员却受伤了。
Dictionary facts from ECDICT, WIKTIONARY, WORDNET.