bor‧row S2 W3 [intransitive and transitive]
to use something that belongs to someone else and that you must give back to them later [↪ lend, loan]: ! Do not confuse borrow and lend (=give someone permission to use something of yours): I borrowed his bike. | Can you lend me your pen?
Can I borrow your pen for a minute?
borrow something from somebody
You are allowed to borrow six books from the library at a time.
They borrowed heavily (=borrowed a lot of money) from the bank to start their new business.
to take or copy someone's ideas, words etc and use them in your own work, language etc
borrow something from somebody/something
I borrowed my ideas from Eliot's famous poem 'The Waste Land'.
To borrow a phrase (=use what someone else has said), if you can't stand the heat get out of the kitchen.
English has borrowed words from many languages.
3 American English informal
to worry about something when it is not necessary