a. 危急的, 惊险的, 一触即发的
在线英汉词典

touch-and-go的短语、例句：

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.