verb slapped, slapping
1 (T) to hit someone quickly with the flat part of your hand: Do you think it's OK to slap children if they're really rude? | slap sb on the back (=hit them on the back in a friendly way)2 (transitive always + adv/prep) to put something down noisily on a surface, especially when you are angry: slap sth on/down: I slapped the report down on his desk and told him to do it again.3 (I) to hit a surface, making a sound like someone being slapped noisily(+ against): Small waves slapped against the jetty slap sb down phrasal verb (T) to unfairly and unkindly criticize someone so that they lose confidence slap sth on phrasal verb (T) informal1 to put or spread something quickly or carelessly onto a surface: She rushed upstairs and slapped on some make-up.2 to suddenly announce a new charge, tax etc, especially unfairly or without warning: Many tour operators slap on supplements for single people.2 noun (C)1 a quick hit with the flat part of your hand: give sb a slap: Julia gave Roy a friendly slap on the cheek.2 a slap in the face an action that seems to be deliberately intended to offend or upset someone, especially someone who has tried very hard to do something: When I wasn't promoted it felt like such a terrible slap in the face.3 a slap on the wrist informal a punishment that is not very severe3 also slap-bang adverb informal hitting something very hard, especially when you are running, driving etc (+ into): I ran slap-bang into a lamp-post.
Longman dictionary of contemporary English. 2004.