To assume control or possession of or responsibility for; an act of assuming control of something, especially the buying out of one company by another.
Gloss: magazine[t] publisher ix retires-wh, poss son will take-it-over
English equivalent: When the publisher of that magazine retires, his son will take it over.
Eyebrows raise at the end of the signed "retire" which indicates "when" (also "if" conditional). [T] in the beginning means topicalization, that is when the signer raises her eyebrows.
The handshapes transform from "5" to "S" with the mouthing "CS" or "CH" which is semantically different from a normal, relaxing lips.