kill off

Meaning: to cause the death of a whole population or an entire species

Synonym: wipe out

For example:

kill off sth Hopefully these new drugs can kill off the AIDS virus in someone who's infected.
kill sth off Did you know that British settlers in Australia killed the Tasmanian aboriginals off in the 19th century?

Quick Quiz:

Scientists have warned that hundreds of species of animals and plants could be killed off by

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