measure word, punctuation, noun · classifier for sums of money, financial transactions, or pieces of business

他赚了一大笔钱。

noun · writing brush or implement such as a pen or pencil

桌子上放着一支笔。

measure word, noun · classifier for the individual strokes of a Chinese character

这个字一共有多少笔？

measure word, verb · brushstroke in painting or calligraphy; technique or style of writing

他在这幅画的角落里又添了一笔。

noun, adverb · to write with a brush or pen

这份正式的遗嘱是由他亲笔书写的。