aparearse betyder på engelska

breed [bred, breeding, breeds]▼(of animals, to mate)
verb
[UK: briːd] [US: ˈbriːd]

mate [mated, mating, mates]▼(copulate)
verb
[UK: meɪt] [US: ˈmeɪt]Tigers are in deadly danger each time they want to mate. = Los tigres corren peligro de muerte cada vez que quieren aparearse.