Meaning of “tar” - Learner’s Dictionary

tar

noun [ U ] uk us /tɑːr/
ROAD

a thick, black substance that is sticky when hot and is used to cover roads

TOBACCO
tar verb [ T ] (present participle tarring, past tense and past participle tarred)

to cover something with tar

(Definition of “tar” from the Cambridge Learner’s Dictionary © Cambridge University Press)