客串

客串	kè chuàn	to appear on stage in an amateur capacity / (of a professional) to make a guest appearance / (fig.) to assume a role outside one's usual duties; to substitute for
客	kè	customer; visitor; guest / classifier for servings or portions (when ordering food)
串	chuàn	to string together / to skewer / to connect wrongly / to gang up / to rove / string / bunch / skewer / classifier for things that are strung together, or in a bunch, or in a row: string of, bunch of, series of / to make a swift or abrupt linear movement (like a bead on an abacus) / to move across