Barrier
来自Big Physics
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late Middle English (denoting a palisade or fortification defending an entrance): from Old French barriere, of unknown origin; related to barre.
wiktionary
From Middle English barryer, barrere, barryȝer, from Old French barriere (compare French barrière), from Old French barre(“bar”).
etymonline
barrier (n.)
"anything meant to obstruct entrance," early 14c., barere, from Anglo-French barrere, Old French barriere "obstacle, gatekeeper," from barre "bar" (see bar (n.1)). First record of barrier reef is from 1805.
