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어원, trud-; trus-= thrust
intrude v. 침입하다; 간섭하다 (intrude into his affairs)
obtrude v. 내밀다 (obtrude his opinion into a family quarrel)
protrude v. 내밀다 (a protruding chin *pro-= forward)
extrude v. 밀어내다; 분사되다 (extruding lava)
abstrusive a. 난해한 (a philosopher's abstrusive teaching *abs-= away; not cf. abstain 삼가다)
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