early 14c., concelen, "to keep close or secret, forbear to divulge," from Old French conceler "to hide, conceal, dissimulate," from Latin concelare "to hide," from con-, here probably an intensive prefix (see con-), + celare "to hide," from PIE root *kel-(1) "to cover, conceal, save." From early 15c. as "to hide or shield from observation." Replaced Old English deagan. Related: Concealed; concealing; concealable.
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