rest

• rest
• 1

  relax

   [intransitive] to stop working or doing an activity for a time and sit down or lie down to relax:
• If you're tired, we'll stop and rest for a while.
• 2

  support something

   [intransitive,transitive always + adverb/preposition] to support an object or part of your body by putting it on or against something, or to be supported in this way [↪ lean]
• rest (something) against/on something
• Rest your head on my shoulder.
• Brassard rested his elbows on the table and leaned forward.
• Their bikes were resting against the wall.
• 3

   rest your feet/legs/eyes etc

  to stop using a part of your body because it is feeling sore or tired:
• I need to sit down and rest my legs.
• 4

   let the matter rest

  also let it rest to stop discussing or dealing with something:
• The man apologized, but Aunt Matilda refused to let the matter rest.
• 5

   rest assured (that)

  formal used to tell someone not to worry, because what you say about a situation is true:
• You may rest assured that it will be ready on time.
• 6

   somebody will not rest until...

  if you will not rest until something happens, you will not be satisfied until it happens:
• We will not rest until the murderer is found.
• 7

  dead person

   [intransitive always + adverb/preposition] literary if a dead person rests somewhere, they are buried there:
• My mother rests beside my father in the family graveyard.
• somebody's last/final resting place (=the place where someone is buried)
• rest in peace (=often written on a grave)
• 8

   rest on your laurels

  to be satisfied with what you have done, so that you do not make any further effort
• 9

   I rest my case

  spoken
• a) formal used by a lawyer when they have finished trying to prove something in a court of law
• b) used when something happens or is said which proves that you were right - used humorously
• 10

   rest easy

  to relax and stop worrying:
• I can rest easy, knowing everything's under control.

• rest on/upon something 

  phrasal verb
• 1 formal to depend on something:
• Success in management ultimately rests on good judgment.
• 2 formal to be based on a particular idea or set of facts:
• The case against my client rests entirely on circumstantial evidence.
• 3 if your eyes rest on something, you notice it and look at it:
• His eyes rested on a small figure in the distance.

• rest with somebody 

  phrasal verb
• if a decision rests with someone, they are responsible for it:
• The final decision rests with the President.

Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.