信笔

信笔	xìn bǐ	to write freely / to express oneself as one pleases
信	xìn	letter / mail / CL:封 / to trust / to believe / to profess faith in / truthful / confidence / trust / at will / at random
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)