The market will not bottom out ,by which point there will be a 40 to 50 per cent drop
bottom out应为动词+副词，类似bottom up干杯一样，是动词+副词；动词+副词
Would she let him catch up with her?
她会让他跟上她吗？
看这句Catch up也是动词加副词；而bottom up这里是名词做动词用，因为词典上找不到bottom是动词的证据，所以也可以理解bottom up和bottom out都省略了作为谓语的动词