verb
    
    -structs; -structed; -structing
    
    [+ obj] somewhat formal
    
    to block (something, such as a pipe or street) so that things cannot move through easily
    
    
    
    
    
    to slow or block the movement, progress, or action of (something or someone)
    
    
    
    
    
    
    
    to be in front of (something) :to make (something) difficult to see