lip service

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Also see: service

Concise Oxford English Dictionary © 2008 Oxford University Press:
lip/lɪp/

▶noun

• 1 either of the two fleshy parts forming the edges of the mouth opening.

  ■ another term for labium.

• 2 the edge of a hollow container or an opening.

• 3 informal impudent talk.

▶verb (lips, lipping, lipped)

• 1 (of water) lap against.

• 2 Golf (of the ball) hit the rim of (a hole) but fail to go in.

– phrases
bite one's lip stifle laughter or a retort.
curl one's lip sneer.
pass one's lips be eaten, drunk, or spoken.
pay lip service to express support for insincerely.

– derivatives
lipless adjective,
lip-like adjective,
-lipped adjective.

– origin OE lippa, of Gmc origin.