冂

jiong

far, remote area

boundary

When a border crossing is closed, it becomes one boundary that is just too far away and impossible to cross.

内

nei 

inside, inner, within

entrance [symbol] + person (ren)

a person enters inside and within himself

呐

na

<modal particle>

mouth 口¹⁶[kǒu] + inner 内 [nèi]

When words (口) are stuck inside (内),  often used as a sentence-final particle to convey various tones or emotions like emphasis, confirmation, or a gentle reminder.

再 / 冉

zai / ran

again, once more

another, re-

to gradually, gently, or softly proceed

 冄 (an archaic variant of 冉) depicted dangling decorations on robes + (丨) for slowly and gently proceeding;

So 冄 + (丨), combined with (一) could go for once again

同

tong

same, together

inside a boundary (冂) one (一) authoritative mouth (口) is same as voice of a tribune