Any of several marine mammals of the order Sirenia, including the manatee and dugong.

(idiomatic, euphemistic) An exclamation of surprise or astonishment.

(idiomatic) Something which cannot be tampered with, or criticized, for fear of public outcry. A person, institution, belief system, etc. which, for no reason other than the demands of established social etiquette or popular opinion, should be accorded respect or reverence, and not touched, handled or examined too closely.

(uncountable, by ellipsis) Mad cow disease; bovine spongiform encephalopathy. / (countable) A cow afflicted with mad cow disease. / Used other than figuratively or idiomatically: see mad, cow.

(cricket, slang) A batting stroke played across the line and aiming to hit the ball towards cow corner.

(business) A product, service, or enterprise that generates ongoing, high net free cash flows. / (by extension) Someone or something which is a dependable source of appreciable amounts of money.

(chiefly US) A fictional pastime wherein a person sneaks up on a sleeping cow and pushes it over.

(humorous) co-worker

A hitch knot used to attach a rope to an object, comprising a pair of half hitches tied in opposing directions. / Any hitch or bend which slips because it is wrongly tied.

plural of cash cow