笔替

笔替	bǐ tì	(poorly paid) ghostwriter or substitute calligrapher
笔	bǐ	writing brush; writing implement (pen, pencil etc) (CL:支,枝) / brushstroke; stroke (in painting or calligraphy) / (bound form) style of writing; literary manner; technique of brushwork / (classifier) stroke of a Chinese character / (classifier) sum of money; financial transaction; piece of business / (literary) to write (with a brush or pen)
替	tì	to substitute for / to take the place of / to replace / for / on behalf of / to stand in for