touch-and-go
adj [usu pred 通常作表语]
(infml 口) uncertain as to the result 无法确定结果; 无把握
It was touch-and-go whether we would get to the airport in time. 我们是否能按时到机场还很难说.
The patient is out of danger now, but it was touch-and-go (ie uncertain whether he would survive) for a while. 病人现已脱离危险, 但曾有一度吉凶未卜.