Longman Dictionary of Contemporary English homepage

Sense: 1-2, 4
Date: 1500-1600
Origin: SMACK1
Sense: 3
Date: 1900-2000
Origin: Perhaps from Yiddish shmek 'sniff, slight smell, small mount of snuff'
Sense: 5
Date: 1600-1700
Language: Dutch
Origin: smak

smack

2 noun
     
Related topics: Drug Culture, Water
smack2
1 [countable]
a) a hit with your open hand, especially to punish a child [↪ slap]:
You're going to get a smack in a minute!
b) British English informal a hard hit with your closed hand [= punch]
smack in the mouth/face/gob
Talk like that and I'll give you a smack in the mouth.
2 [countable usually singular] a short loud noise caused when something hits something else:
The book landed with a smack.
3 [uncountable] informalMDD heroin
4

give somebody a smack on the lips/cheek

informal to kiss someone loudly
5 [countable]TTW a small fishing boat
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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