to take or obtain with the promise to return the same or an equivalent

Our neighbor borrowed my lawn mower.

to use, appropriate, or introduce from another source or from a foreign source

to borrow an idea from the opposition; to borrow a word from French.

Arithmetic . (in subtraction) to take from one denomination and add to the next lower.

to borrow something

Don't borrow unless you intend to repay.

Nautical .

to sail close to the wind; luff.

to sail close to the shore.

Golf . to putt on other than a direct line from the lie of the ball to the hole, to compensate for the incline or roll of the green. ?

borrow trouble

to do something that is unnecessary and may cause future harm or inconvenience.