Question: Here is one sentence: The "war on drugs" is a campaign against the use of narcotic drugs.
Here is another sentence: The war on poverty.
Does the war mean the same thing in the two sentences?

Answer: the same meaning

Question: Here is one sentence: He was on the heavy side.
Here is another sentence: Look on the bright side.
Does the side mean the same thing in the two sentences?

Answer: the same meaning

Question: Here is one sentence: They were in the eye of the storm.
Here is another sentence: Bright lights really hurt my eyes.
Does the eye mean the same thing in the two sentences?

Answer: different meanings

Question: Here is one sentence: The accusative case canonically indicates a direct object.
Here is another sentence: A case of the jitters.
Does the case mean the same thing in the two sentences?

Answer:
different meanings