(idiomatic) To be deluded, to be mistaken; to need to rethink something one has determined; to need to reconsider one's plans or expectations.

(idiomatic, especially US) Alternative form of have another think coming

Synonym of have eyes bigger than one's stomach

Essential to own.

An item that one must own, or a feature that is essential to a service, etc.

(Britain) To hem and haw / (Scotland) To talk foolishly; to chatter.

(UK, Scotland, dialect) Oats (the cereal).

One who has something; a possessor. / (law, Scotland) The person who has custody of a document.

(obsolete) To shout out 'Havoc!'; that is, to give an army the order to plunder.

Widespread devastation and destruction. / Mayhem.