hurdle vs let

hurdle

noun
  • An obstacle, real or perceived, physical or abstract. 

  • An artificial barrier, variously constructed, over which athletes or horses jump in a race. 

  • A movable frame of wattled twigs, osiers, or withes and stakes, or sometimes of iron, used for enclosing land, for folding sheep and cattle, for gates, etc.; also, in fortification, used as revetments, and for other purposes. 

verb
  • To compete in the track and field events of hurdles (e.g. high hurdles). 

  • To overcome an obstacle. 

  • To jump over something while running. 

  • To hedge, cover, make, or enclose with hurdles. 

let

noun
  • An obstacle or hindrance. 

  • The hindrance caused by the net during serve, only if the ball falls legally. 

  • The allowing of possession of a property etc. in exchange for rent. 

verb
  • To give, grant, or assign, as a work, privilege, or contract; often with out. 

  • Used to introduce a first or third person imperative verb construction. 

  • To cause (+ bare infinitive). 

  • To allow the release of (a fluid). 

  • To allow possession of (a property etc.) in exchange for rent. 

  • To allow to be or do without interference; to not disturb or meddle with; to leave (someone or something) alone. 

  • To allow to, not to prevent (+ infinitive, but usually without to). 

How often have the words hurdle and let occurred in a corpus of books? (source: Google Ngram Viewer )