Etymology
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Words related to *klau-

preclude (v.)

1610s, "prevent by anticipative action," from Latin praecludere "to close, shut off; hinder, impede," from prae "before, ahead" (see pre-) + claudere "to shut" (see close (v.)). The more literal sense of "close, shut up, prevent access to" (1620s) probably is obsolete. Related: Precluded; precluding.

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recluse (n.)

c. 1200, "person shut up or withdrawn from the world and secular living for purposes of religious meditation," originally and especially as a member of a religious community, from Old French reclus (fem. recluse) "hermit, recluse," also "confinement, prison; convent, monastery," noun use of reclus (adj.) "shut up," from Late Latin reclusus, past participle of recludere "to shut up, enclose" (but in classical Latin "to throw open"), from Latin re-, here perhaps an intensive prefix (see re-), + claudere "to shut" (see close (v.)).

Also in part via Medieval Latin nouns reclusus, reclusa. By late 17c. in the secular and softened sense of "one who lives a retired life and mixes little in society." Middle English also had a verb reclusen "to shut up (in some place), confine," and the past-participle adjective reclused "living in seclusion" (c. 1200). Recluse as an adjective meaning "shut up or apart from the world" is attested from early 13c. Also in Middle English was reclusion "state of retirement from the world" (c. 1400), from Medieval Latin reclusionem.

seclude (v.)

mid-15c., secluden, transitive, "to cut off from, shut or keep out" (implied in ben secluded), a sense now archaic, from Latin secludere "shut off, confine," from se- "apart" (see se-) + -cludere, variant of claudere "to shut" (see close (v.)). The meaning "remove or guard from public view" is recorded from 1620s. Related: Secluded; secluding.

slot (n.2)

"bar or bolt used to fasten a door, window, etc.," c. 1300, from Middle Dutch or Middle Low German slot (compare Old Norse slot, Old High German sloz, German Schloss "bolt, bar, lock, castle;" Old Saxon slutil "key," Dutch slot "a bolt, lock, castle"), from Proto-Germanic stem *slut- "to close" (source also of Old Frisian sluta, Dutch sluiten, Old High German sliozan, German schliessen "to shut, close, bolt, lock"), from PIE root *klau- "hook," also "peg, nail, pin," all things used as locks or bolts in primitive structures.

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