smack
verb uk/smæk/ us/smæk/
[ T ]（尤指作为惩戒孩子的方式）掌掴，打
to hit someone or something forcefully with the flat inside part of your hand, producing a short, loud noise, especially as a way of punishing a child
I never smack my children. 我从来不打孩子。
I'll smack your bottom if you don't behave yourself. 如果你表现不好，我就打你屁股。
[ I or T, usually + adv/prep ]撞;使劲摔
to hit something hard against something else
I smacked my head on the corner of the shelf. 我的头撞在了架子角上。
She smacked her books down on the table and stormed out of the room. 她啪地把书摔在桌子上，气冲冲地离开了房间。
Idiom
smack your lipsidiom 咂嘴
to close and open your mouth loudly to express a strong wish to eat something you like a lot
"I love chocolate cake," said Susannah, smacking her lips. “我喜欢巧克力蛋糕，”苏珊娜边咂着嘴边说道。
Phrasal verb
smack of something 带有…意味，带有…迹象
If something smacks of an unpleasant quality, it seems to have that quality.
The whole situation smacks of mismanagement and incompetence. 整件事让人觉得有点儿管理不善，当事人能力欠缺。
smack
noun uk/smæk/ us/smæk/
(HIT FORCEFULLY)
[ C ]（作为惩戒手段的）打巴掌，掴
a hit from someone's flat hand as a punishment
You're going to get a smack on the bottom if you don't stop throwing your toys. 如果你再乱扔玩具，就该打屁股了。
[ C ] informal（用握成拳的手）打
a hit given with the fist (= closed hand)
I gave him a smack on the jaw. 我一拳头打在他下巴上。
[ C ]呯的一声，啪的一声
a short, loud noise
She slammed her briefcase down on the desk with a smack. 她啪的一声把她的皮箱放到桌子上。
[ C ] informal响吻
a loud kiss
a big smack on the lips 在嘴唇上的响亮一吻
(DRUG)
[ U ] slang海洛因
heroin (= a strong illegal drug)
How long has she been on smack? 她吸海洛因多长时间了？
smack
adverb uk/smæk/ us/smæk/ (UK also smack bang); (US also smack dab)
(EXACTLY)
不偏不倚地，正好
exactly in a place or a situation
She lives smack in the middle of Shanghai. 她住在上海市的正中心。
US The kids are smack dab in the middle of the fight between their parents. 父母吵架时，孩子们被夹在正中间。
(DIRECTLY)
径直，猛地;砰然作声地
directly and forcefully, producing a short, loud noise
I wasn't looking where I was going and walked smack into a lamppost. 我没有看路，直愣愣地撞到了灯柱上。