Thumbing a lift had once a carefree, easy-going image.是什么意思？

Thumbing a lift had once a carefree, easy-going image.

伸手搭便车曾经给人以轻松随意的形象。

Thumbing

vi. 翘起拇指请求搭乘（过路汽车），示意请求搭便车（thumb的现在分词形式）；

lift

vt.& vi. 举起，抬起；vt. 举起，提升，鼓舞，抬起；vi. 消散，升起，耸立；n. 电梯，举起，起重机，搭车；

例句
Striking lorry drivers agreed to lift their blockades of main roads...
罢工的卡车司机们同意解除对主干道的封堵。

had

v. 有（ have的过去式和过去分词 ），（亲属关系中）接受，拿，买到；

例句
He claimed that his parents had abandoned him...
他声称父母遗弃了他。

once

adv. 一次，一趟，一倍，曾经，一旦；conj. 一旦…就…，一经；n. 一次，一回；

例句
The Hell's Angels were once the most notorious and anarchistic of motorbike gangs.
“地狱天使”曾是飞车党中最臭名昭著和无法无天的一伙。

carefree

adj. 无忧无虑的，快乐舒畅的，逍遥自在，宽畅，闲逸；

例句
They certainly gave the impression of a carefree couple who delighted in each other's company...
他们让人明显感觉是一对无牵无挂只求长相厮守的夫妻。

image

n. 影像，肖像，概念，意向，镜像，映像；

例句
The image of the fox as a pest is grossly exaggerated in anecdote and folklore.
狐狸的害人精形象在传闻和民间故事中遭到严重的夸大。