A set of rules or guidelines that one has to follow in a particular situation; etymologically, a set of things that one should do or not do in such situation.

plural of leaving do

(computing) An application which allows software to run in protected mode, even though the host operating system runs only in real mode.

plural of do-little

(colloquial) One who performs little though professing much.

Used to indicate that somebody does not wish to be disturbed, e.g. a sign on a hotel room door, or a "busy" mode of an instant messenger.

Indicates that an area should not be entered, e.g. a military installation, or as a sign on a hotel room door.

(euphemistic) To have sex. / Used other than figuratively or idiomatically: to do a given deed.

(obsolete) To take off (clothing). / (slang) To kill, to bump off

(UK) A stag party.