Problem: Sentence1: Strengthen the relations between the two countries.
Sentence2: This exercise will strengthen your upper body.
Q: Does the term strengthen mean the same thing in both these sentences?

Answer: the same meaning

Problem: Sentence1: The figure was about a thousand.
Sentence2: She made the best score on compulsory figures.
Q: Does the term figure mean the same thing in both these sentences?

Answer: different meanings

Problem: Sentence1: They made a check of their equipment.
Sentence2: He paid all his bills by check.
Q: Does the term check mean the same thing in both these sentences?

Answer: different meanings

Problem: Sentence1: Which side of the tray shall I put it on?
Sentence2: He is on the purchasing side of the business.
Q: Does the term side mean the same thing in both these sentences?

Answer:
different meanings