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As I am going over the uses of N5 kanji, I have gotten confused as to why 口(ぐち) is used in places such as 出口 and 入口. What meaning does it add?

6

As you are probably aware, 口 has the meaning of mouth. However, when you look at the Jisho.org definition, you will also find the definition of opening; hole; gap; orifice as well.

What meaning does it add?

In this case, the meaning that is added is pretty simple, opening.

Combining 出 with 口, you get a hole for exiting. You will encounter this at many building and parking lot exits, but it exists many other places as well.

Combining 入 with 口, you get a hole for entering. You will encounter this at many building and parking lot entrances. As with 出口 you will also see it in other places as well.

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7

In 出口 and 入口,「口」describes the doorway.

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5

Here 口 means "doorway" giving

  • 入口 "entry" ("entering doorway")
  • 出口 "exit" ("exiting doorway")

Of course the principal meaning of 口【くち】 is "mouth" — the opening through which humans or animals take in food. However, besides this literal meaning, "mouth" also has an extended meaning, also in English:

mouth

2 An opening or entrance to a hollow, concave, or enclosed structure.

‘the mouth of a cave’

A very similar meaning exists also in Japanese and a monolingual dictionary will list something like the following (taken from 大辞林):

  1. 通り抜けることができる空間。複合語としても用いる(この場合、多く「ぐち」となる)。

    ㋐ 穴やすき間。 「傷-」 「船腹に-があく」

    ㋑ ものを出し入れする所。また、そこをふさぐもの。 「瓶の-」 「 -がかたくて抜けない」

    ㋒ 人の出入りする所。戸口。 「 -が狭い」 「登山-とざんぐち」 「非常-ひじようぐち

roughly translating to

  1. a space where it is possible to pass through; …

    ㋒ where people enter and exit; door or doorway

Note that there are many more such words — the cited dictionary entry gives the following examples:

  • 非常口 "emergency exit"
  • 登山口 meaning the start of an ascending mountain trail.
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