(retail) An item of merchandise that needs to be returned to a shelf or rack, for example because a customer has decided not to purchase it or has brought it back for an exchange.

(dated, US) A supposed disease of children causing weight loss and lack of growth.

(idiomatic) Indicates that given plans or actions can proceed.

(Alaska) A snowmobile.

(Alaska) To travel by snowmobile.

To be in cahoots (with).

One instance of a recurring event.

(card games) In the game of napoleon, to declare all five tricks success, rewarded by double payment all round.

(slang) A speedboat.

(sociology) To be rapidly and frequently shared, especially through social media, but (with retroactive application to pre-internet occurrences) also via gossip or as a collective response to broadcasting or widespread print circulation.