悄然潜行
to be moving around quietly in a place trying not to be seen or heard
There was a fox on the prowl earlier. 早些时候有只狐狸出没于此。
His photographs of cheetahs on the prowl were stunning.
The police dog went on the prowl, sniffing for drugs.
Mountain lions have been spotted on the prowl near here, so be careful while out hiking.
She filmed a pride of lions on the prowl for elephants.
See also: prowl noun