difference between hurry and hurry up

hurry - (яарах, хурдлах, хурдлуулах, түргэлүүлэх)"Hurry" means "do it quickly!"
1 [intransitive] to do something more quickly than usual because there is not much time
        ---- The kids hurried to open their presents.
2 [transitive] to make someone do something more quickly
hurry someone
        --- I don't want to hurry you, but we close in twenty minutes
hurry up - (яарах, хурдлах, хурдлуулах, түргэлүүлэх)Hurry up might be considered a bit less formal. "Hurry up" means "do it faster!"

1

hurry up (with something)

to do something more quickly because there is not much time

        ---- I wish the bus would hurry up and come.

2

hurry someone/something↔up

 to make someone do something more quickly; to make something happen more quickly

        ---- Can you do anything to hurry it up?

difference between hurry up and hurry

(Hello everyoneTell me please, what should I use here - "Let's hurry" or "Let's hurry up":)

• Both "let's hurry" and "let's hurry up" are correct and fairly idiomatic.
  
  If you said simply "hurry up," you aren't including yourself, but only urging the other/others to hurry. It becomes a command, one that others might be likelier to find irritating(уур хүрмээр).

• "Let's hurry" and "let's hurry up" both sound like normal, conversational English to me, an AE speaker, particularly if you are trying to be polite. For example, if you had a group of small children or a group of unfocused elders and you were trying to urge them to get going, "let's hurry up (now)" would be exactly what I would expect to hear.

• No difference to me, lamy08. Hurry up might be considered a bit less formal, but not to the point of being slang.

• Both sound fine to me.
  If you were asking about the difference between the two, this is the distinction I'd make:
  "Hurry" means "do it quickly!"
  and
  "Hurry up" means "do it faster!"
  
  So, "Let's hurry" just simply means that you should be remembering to do your shopping quickly, in order to have it done before the supermarket closes,
  whereas "Let's hurry up" means that your current pace is too slow, and that you should speed up your shopping in order to finish before the supermarket closes.