Definition of caboose

What does the word caboose mean?

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Undisturbed political condition, public tranquility; silence, stillness; being free from disturbance or agitation urgent tasks, rest, repose, peace of mind; unruffled department, calm. [Latin] With no or slight gentle sound motion; of inactive disposition; (colour, dress, &c.) unobtrusive, not showy; overt, private, disguised, (q. resentment; had a dig at him; esp. on the q., slang abbr. t., secretly); undisturbed, interfered interrupted, free far from strife uproar; enjoyed in q.; tranquil, anxious remorseful. Hence quietly adv., quietness, quietude, nn. [Latin] Reduce to quietness, soothe, calm; become q. (rare; usu. q. down). [Latin]