(chiefly US, idiomatic) To be naive, uninformed, or unsophisticated, in the manner of a rustic person.

(literally) To remain present in a retail business, in order to maintain the security of the premises and to serve customers.

(biblical) Four beings in Revelation 6:1–8 that bring about the Apocalypse, each riding a different-colored horse representing a different aspect of the Apocalypse.

(idiomatic) To go to war; to use ruthless tactics; to act without restraint.

(US, idiomatic, finance, of a money-market fund) Fall below the value of one dollar per share.

(idiomatic) To be grateful, feel oneself fortunate.

Alternative form of there are plenty of fish in the sea

There are many more potential opportunities available.

present participle of cross the aisle

(chiefly US, idiomatic, politics) To vote, unite, or otherwise co-operate with members of another political party in order to achieve governmental or political action.