What is a pedal??
It is a lever operated by foot.....right??
Now take on some words, which have ped(foot) in them.
 
Impede: to block, make progress or action difficult.
usage: He is trying to impede our progress.
 
Impediment: a hindrance or obstruction.
usage: It is an impediment to our success.
 
Expedite: ([Ex=out + pedis] = out from foot): Speed up.
When you expedite something, you are freeing something, which is caught by feet. Hence you are hastening it. 
usage: The PM asked the committee to expedite the investigation.
 
Octopod: Any animal with 8 (octo) legs.
See also Octopus.
 
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