Answer: think

AnswerCrossword Clue
THINK

Use one's head

THINK

Ironic twist to a one-word maxim.

THINK

Office sign.

THINK
... twice (reconsider).
THINK
Cerebrate.
THINKPopular office sign
THINKUse gray matter
THINKCerebrate
THINKOffice-wall sign
THINKCorporate motto
THINKKind of tank
THINKMuse
THINKIdeate
THINK"Just .....!"
THINKExcogitate.
THINKUse the bean
THINKReflect
THINKUse one's bean
THINK"Concentrate!"
THINKGet lost in a brown study
THINKSomething to do twice?
THINK"I need you to remember this!"
THINKGet ideas
THINKBrainstorm
THINKUse one's gray cells
THINKOld IBM motto
THINKEngage in cerebration
THINKAptly named Final Jeopardy! theme song
THINKFamous IBM office sign
THINK"C'mon, Aimee, ...! There's gotta be a good clue out there for this word ..."
THINKBe reasonable?
THINKUse your head
THINKRack one's brains
THINK"Try to remember!"
THINKReason
THINKType of tank
THINKTank type
THINK"Use your head!"
THINKCogitate
THINKEnd of the observation