A glass of beer before dinner helped him unwind.是什么意思？

A glass of beer before dinner helped him unwind.

饭前喝一杯啤酒使他轻松了.

glass

n. 玻璃，玻璃制品，镜子；vt. 给某物加玻璃，反映，使平滑如玻璃；vi. 成玻璃状；

例句
Mitzi nodded a perfunctory acknowledgement as her glass was filled.
杯子被倒满时米芝敷衍性地点头示意。

of

prep. 关于，属于…的，由…制成；aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气]；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

beer

n. 啤酒，麦酒，（一般）发酵饮料，[印，纺]比尔；

例句
On a table pushed against a wall there were bottles of beer and wine.
在一张靠墙的餐桌上有啤酒和葡萄酒。

before

prep. 在…之前，先于，优于，当着…的面，与其…；conj. 在…之前，在…以前，比…早些，与其…；adv. 先前，从前，在前，在前方；

例句
He pleaded guilty before a court martial to absenting himself without leave.
在军事法庭上他对自己擅离职守表示服罪。

dinner

n. 正餐，主餐，宴会，晚餐；

例句
At the dinner table, my father would go on and on, showing off, aggrandising himself...
我父亲在餐桌上总是滔滔不绝地炫耀并吹嘘自己。

helped

v. 帮助( help的过去式和过去分词 )，有助于，有利于，治疗，避免；

例句
The scriptwriter helped him to adapt his novel for the screen...
编剧帮助他将其所著小说改编成电影。

him

pron. (he的宾格)他；

例句
They said goodbye to him as he got aboard the train at Union Station.
当他在联合火车站登上火车之际，他们向他道别。

unwind

vt.& vi. 展开，从缠绕中解开，（使）心情轻松；vi. 放松，解开，松开；

例句
...a local restaurant where steel workers unwind after hours...
钢厂工人下班后去放松一下的当地餐馆