verb · to tie or bind

她用丝带把头发扎了起来。

verb · to prick or stick a needle or sharp object into something

护士在他胳膊上扎了一针。

verb · used in 挣扎 zhēng​zhá (to struggle)

他在水里拼命地挣扎。

idiom, verb · (of troops) to be stationed at a specific location

为了守住入城口，军队在桥头扎了下来。

measure word · a mug or jug used for serving beer (loanword from English)

我们要了一扎啤酒。

measure word · classifier for things tied in a bunch, such as flowers or banknotes

花瓶里插着一扎红玫瑰。