a usu rectangular piece of fabric of distinctive design that is used as an identifying symbol, e.g. of a nation, or as a signalling device, esp one flown from a single vertical staff

a similarly designed device used to give a starting or finishing signal at motorcycle or car races

a flag-shaped marker indicating a hole on a golf course, or a smaller device for pinpointing positions on a map

a small paper flag on a pin, given esp formerly, as a badge to contributors to a charity on a flag day

something, e.g. a strip of paper inserted into an opening of a book or a piece of coding inserted into a computer file, used as a marker

NAmer the name of a newspaper in its front-page typographical form; = masthead¹ (2)

the part of a taximeter that projects upwards when the taxi is for hire

the underside of an upturned tail, esp that of a deer

to mark (a page, word, or passage) with a paper strip or sticker or with a piece of coding

to direct (e.g. the driver of a vehicle, competitor in a race, etc) somewhere by signalling with the hands or a flag

flag the starters off

He flagged me into the kerb

to provide or decorate (something) with a flag or flags

to send (a message) using flags, e.g. in semaphore

to grow tired; to lose energy

Some of the marchers were beginning to flag

Our spirits flagged

to become feeble, less interesting, or less active; to decline

Conversation flagged

Interest flagged

a hard evenly stratified stone that splits into flat pieces suitable for paving

a slab of this; = flagstone (1)