两肋插刀

lit. knifes piercing both sides (idiom) / fig. to attach a great importance to friendship, up to the point of being able to sacrifice oneself for it

two / both / some / a few / tael, unit of weight equal to 50 grams (modern) or 1⁄16 of a catty 斤[jin1] (old)

rib / Taiwan pr. [le4]

to insert / stick in / pierce / to take part in / to interfere / to interpose

old variant of 插[cha1]

knife / blade / single-edged sword / cutlass / CL:把[ba3] / (slang) dollar (loanword) / classifier for sets of one hundred sheets (of paper) / classifier for knife cuts or stabs