Definition of Flag

Noun: flag flag

Emblem usually consisting of a rectangular piece of cloth of distinctive design
A listing printed in all issues of a newspaper or magazine (usually on the editorial page) that gives the name of the publication and the names of the editorial staff, etc.
- masthead
Plants with sword-shaped leaves and erect stalks bearing bright-coloured flowers composed of three petals and three drooping sepals
- iris, fleur-de-lis, sword lily
A rectangular piece of fabric used as a signalling device
- signal flag
Flagpole used to mark the position of the hole on a golf green
- pin
Stratified stone that splits into pieces suitable as paving stones
- flagstone
A conspicuously marked or shaped tail
(computer science) an option otherwise modifying the action of a command or program

Verb: flag (flagged,flagging) flag

Communicate or signal with a flag
Provide with a flag
"Flag this file so that I can recognize it immediately"
Droop, sink, or settle from or as if from pressure or loss of tautness
- sag, droop, swag
Decorate with flags
"the building was flagged for the holiday"
Become less intense
- ease up, ease off, slacken off