Answer:

stop

Answer	Crossword Clue
STOP	".. the music!"
STOP	Depot
STOP	Halt

STOP	Octagon message
STOP	Organ piece
STOP	Railroad-crossing word
STOP	Scrub a mission
STOP	Cease movement
STOP	Discontinue
STOP	Glottal ..
STOP	Knock off

STOP	Sign at a RR crossing
STOP	Supremes' hit "...! In the Name of Love"
STOP	Cease
STOP	Cease and desist
STOP	Layover
STOP	Octagonal sign
STOP	Traffic sign
STOP	Halt, and also a word that precedes 1A

STOP	Word on the street
STOP	Word repeated to a three-year-old, usually in vain
STOP	Telegram "punctuation"
STOP	Wire word
STOP	Bit of sign language?
STOP	Where to get off
STOP	"Say no more!"
STOP	Corner sign

STOP	Arrest
STOP	React to red
STOP	Red light
STOP	Organ knob
STOP	Nip in the bud
STOP	Period
STOP	Quit
STOP	"Let it be!"

STOP	Cut it out
STOP	Give it a rest
STOP	Bus-map marking
STOP	Quit working
STOP	Word in an octagon