Step 1: Understanding the Question:
The task is to identify the correct figurative meaning of the common English idiom ``Hand in glove''.
Idiomatic expressions cannot be interpreted literally; instead, they have established figurative meanings that we must recognize.
Step 2: Detailed Explanation:
1. The idiom ``hand in glove'' (often used as ``hand in glove with someone'') is derived from the physical relationship between a hand and a well-fitted glove.
2. A glove fits a hand extremely closely, moving in perfect alignment with it. This imagery is used metaphorically to describe two or more entities working in very close association, collusion, or cooperation.
3. Often, though not exclusively, this idiom is used to describe a close partnership in suspicious, devious, or dishonest activities. For example: ``The corrupt politician worked hand in glove with the local mafia.''
4. Let us evaluate the options:
- Option (A) ``To work in close cooperation'' is the accurate definition of this idiom. It captures the essence of working in tight agreement or partnership, which corresponds to the snug fit of a glove on a hand.
- Option (B) ``To hide one’s intentions'' might sound plausible because gloves can cover hands, but this is not the figurative meaning of the idiom. The idiom for hiding intentions is closer to ``keeping cards close to one's chest''. Therefore, this option is incorrect.
- Option (C) ``To lose an opportunity'' is unrelated to the expression. Phrases like ``to miss the boat'' convey this meaning. Thus, this option is incorrect.
- Option (D) ``To fight aggressively'' is also incorrect. Idioms like ``to take off the gloves'' or ``to go at it tooth and nail'' denote aggressive fighting, but ``hand in glove'' means cooperation.
Step 3: Final Answer:
Therefore, the correct option is (A).