What’s the difference, in the context of someone trying to accomplish something but has to overcome/face difficulty first?
You clear a hurdle or get over it. Picture a footrace with hurdles. There they are in a line, and you have to clear them in order one at a time.
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You clear a hurdle or get over it. Picture a footrace with hurdles. There they are in a line, and you have to clear them in order one at a time. There is no implication that you might fall at one of them; the metaphor does not extend that far. It's just that you can't clear the next one before you have cleared the one before, and it takes effort.
You hit a stumbling block. This metaphor