The Chinese word for to cross your arms is
交叉双臂

jiāo chā shuāng bì

to cross your arms

Chinese Definition

Components
交
1. to intersect; to cross
相交 - to intersect
交好運 - to meet with good fortune -
2. to reach (a certain time)
3. time or place where two things meet
春夏之交 - when springs changes into summer -
世紀之交 - the turn of the century -
地處豫晉兩省shěnɡ 之交 - located where the borders of Henan and Shanxi meet
4. to hand over; to turn in; to submit
交班 - to hand over to the next shift
交功課 - to turn in homework -
交咗租未？ - Have you paid rent?
請把任務交給我吧！ - Please assign me the task!
5. to make (friends)
交.朋友 - to make a friend
交男朋友 - to get a boyfriend -
6. friendship; relationship
邦交 - diplomatic relations
泛泛之交 - acquaintance
君子.之.交.淡.如.水 - True friendship between two men of accomplishment need not be overly demonstrative.
7. to have sexual intercourse; to mate
肛交 - to have anal sex
雜交 - to hybridize; to crossbreed
8. mutually; reciprocally
交談 - to converse
交易 - to trade
9. simultaneously; at the same time
10. 16th tetragram of the Taixuanjing; "contact" (?)
11. (obsolete) Alternative form of 跤 (-)
12. (Hokkien, dated) (Used to refer to a private wholesale trading company)
(Alternative form 郊)
13. Variant of 跤
14. (Xiamen, Quanzhou, &, Philippines Hokkien) and
15. (Xiamen, Quanzhou, &, Philippines Hokkien) with; accompanying
叉
1. (Cantonese) to charge; to recharge
幫我拎個手機去叉吖。 - Take my cellphone to recharge it for me.
2. Variant of 衩
3. Variant of 扠
4. Variant of 杈
5. Variant of 汊
双
1. Variant of 雙
臂
1. (anatomy) arm