semaphore

v [I, Tn, Tf, Dpr.f, Dpr.w, Dpr.t nopassive 不用於被动语态] send (messages) by semaphore 用旗语发送（信息）: semaphore (to sb) that help is needed/to send help （向某人）打旗语求救.

selfishness, selfless, selflessly, selflessness, selfsame, sell, sell off, sell out, sell up, sell-by date, sell-out, seller, seller's market, selling price, selling-point, Sellotape, selvage (also selvedge), selves, semantic, semantics, semblance, semen, semester, semi, semi-, semi-conscious, semi-detached, semi-skilled, semibreve, semicircle, semicircular, semicolon, semiconductor, semifinal, semifinalist, seminal, seminar, seminarist, seminary, semiotics,