What's "hold seats" mean here?

Can you tell me the difference between "during" and "while"? They seem so similar!

Great question. "While" and "during" are indeed both very similar. Both words are used to talk about actions happening at the same time. "While", like "during", indicates two events happening at the same time. However, it is a conjunction; so,it is followed by a sentence (while + subject + verb...). Ex: My father was washing his car while my mother was cooking. Ex: While my brother was driving I was reading a book. So, it’s used to talk about two events; yet, one starts in the middle of another action. "During" unlike "while" should always be followed by a noun or a pronoun’. The word "during" is a preposition, not a conjunction. You cannot say "During she…. / During I…" because the preposition is always followed by a noun, not a clause with a subject and a verb. Ex: During dinner, we talked about school. Ex: She slept during the movie.

What's "entrust" mean? Does it have to do something with "trust" at all?

"Entrust" means to assign a role or responsibility to a person or to give them something to look after and protect. It does involve "trust" because you're "trusting" the person to do that job or task. If someone "entrusts" something, it usually means they won't be supervising a lot or checking in much, so they have to trust the other person to do it. Ex: Can I entrust you with taking care of my dog this weekend? Ex: My boss entrusted me with hosting the event, so I have to be there early.

What is the difference between "villain" and "wicked"?

A "villain" is a character (noun) who's actions and intentions are evil. "Wicked" is an adjective that describes someone or something evil. Ex: The Joker is the villain in Batman. Ex: That witch is wicked.

What's "hold seats" mean here?

When we hold seats for someone, it means that we reserve a place for them to sit. In some cinemas, the seats are not reserved, and anybody can sit anywhere. To make sure that we can find a seat with our friends, we can ask them to save seats for us. Ex: Save a seat for me at the table, please. = Please keep a seat reserved for me at the table. Ex: Sorry, you can't sit here. I'm saving this seat for a friend. = Sorry, you can't sit here. I'm keeping this seat reserved for my friend.

What's "in retrospect" mean?

"In retrospect" means to look back in time and consider things differently- to reflect on the past. One could also use "in hindsight." Ex: In retrospect, I should have studied law. I regret studying marketing. Ex: You know, in retrospect, I should have packed lunch for the trip.