亦
エキ, ヤク, また
also, again
JLPT1 G13 S0 F5000
The relevant oracle bone form of this character is 大 stand outstretched + two marks indicating the two sides of the body → slender line of people standing outstretched → *also*; *again* (← one person after another); *armpit* (← sides of the body). Compare 胳 and 脇.
[Full Kanji Etymology List]