barrier; obstruction; hindrance; impediment; obstacle

obstacle; hindrance

diversionary tactic; smokescreen

barrier

to hinder the eyesight; (fig.) to trick into not noticing

malfunction; breakdown; defect; shortcoming; fault; failure; impediment; error; bug (in software)

to ensure; to guarantee; to safeguard

roadblock; barricade

learning difficulties (handicap); retarded

barrier