The Chinese word for to slap is
拍击

pāi jī

Chinese Definition

slap
1. 拍，掌击
Components
拍
1. to pat; to slap; to clap; to swat; to hit with a flat surface (palm, swatter, etc.)
拍蚊 - to swat mosquitoes -
2. racquet; swatter (flat implement for hitting)
蒼蠅ying拍 - flyswatter -
3. to take; to shoot (a picture, a video, etc.)
他拍的照片全部都是過曝bào 的。 - The pictures he took are all overexposed.
拍片pin3-2 - to shoot a video -
4. to send (a telegram)
拍電報 - to send a telegram
5. (Cantonese) to move an object closer to another object; to be near; to become near
拍返埋張凳 - put the chair back under the table
拍牆 - to stick to the wall -
拍埋一齊 - to put two things next to each other -
6. (Cantonese, figuratively) to cooperate
拍住上soeng5 -
7. (Min) to hit; to beat; to whack
拍尻川 - to spank someone's bottom, MN
8. (Min) to call on the phone
拍電話 - to call someone on the phone, MN
拍手機 - to call someone's cellphone, MN
9. (Wuhan) to brownnose; to suck up; to kiss someone's ass
10. (music)
每小節有四拍。 - Every measure has four beats.
11. Variant of 髆
击
1. Simplified form of 擊