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lip-service (n.)

"something proffered but not performed, service with the lips only; insincere profession of good will," 1640s, from lip (n.) + service (n.1). Earlier in same sense was lip-labour (1530s). This was a general pattern in 16c.-17c., for example lip-wisdom (1580s), the wisdom of those who do not practice what they preach; lip-religion (1590s), lip-devotion "prayer without genuine faith or desire" (c. 1600); lip-comfort (1630s).