What is a recession? Risks are rising, economists say. Here’s what to know. [Video]

Recession fears are mounting on Wall Street.

Goldman Sachs and Moodys Analytics in recent days joined forecasters raising alarm about the increased likelihood of an economic downturn.

President Donald Trump declined to rule out the possibility of a recession in remarks to reporters on Sunday.

The warnings coincided with a market plunge touched off by U.S. tariffs against Canada, Mexico and China, some of which were delayed. Retaliatory tariffs issued by China on Monday deepened a trade war between the worlds two largest economies.

“The threat of a recession is real,” said Olu Sonola, the head of U.S. regional economics at Fitch Ratings. “Its a threat you cannot ignore.”

Heres what to know about rising concern about a recession, whats driving it and what it could mean for you:

The r-word is popping up

Recession signals have begun to flash warnings, some analysts told ABC News.

Many observers define a recession through the shorthand metric of …