Real Dictionary

tusk
countable noun: The tusks of an elephant, wild boar, or walrus are its two very long, curved, pointed teeth.

tusk in American English
in elephants, wild boars, walruses, etc., a very long, large, pointed tooth, usually one of a pair, projecting outside the mouth and used for defense, digging up food, etc.
to dig, gore, etc. with a tusk or tusks
intransitive verb: to dig up or thrust at the ground with the tusks
noun: a tooth developed to great length, usually one of a pair, as in the elephant, walrus, and wild boar, but singly in the narwhal
transitive verb: to dig up or tear off with the tusks

tusk in British English
noun: a pointed elongated usually paired tooth in the elephant, walrus, and certain other mammals that is often used for fighting
noun: Donald. born 1957, Polish politician; prime minister of Poland (2007–14); president of the European Council (2014–19)
verb: to stab, tear, or gore with the tusks