Select the most appropriate meaning of the given idiom.

Tide someone over

Give temporary help, usually financial

The most appropriate meaning of the idiom "tide someone over" is to give temporary help, usually financial. It is an informal expression that means to help someone through a difficult or challenging time, especially by providing financial assistance. The idiom is thought to have originated in the 19th century, and it is believed to be a reference to the way that the tide can help to carry a boat over a sandbar or other obstacle.

The other options for the meaning of the idiom are incorrect. Asking someone for financial assistance does not mean to tide them over. Getting a boat ready to cross a river or water body does not mean to tide them over. Completing a voyage successfully does not mean to tide them over.