secede

v. 正式脱离或退出（组织）

seaside, season, seasonable, seasonably, seasonal, seasonally, seasoned, seasoning, seat, seat-belt (also `safety-belt), seating, SEATO, seaward, seawards, seaweed, seaworthiness, seaworthy, sebaceous, sec, secateurs, secession, seclude, secluded, seclusion, second, second cousin, second floor, second hand, second in command, second lieutenant, second sight, second-best, second-degree, second-guess, second-hand, second-rate, second-string, secondarily, secondary, seconder,