cannot do/ touch; to control one's desire, for example, gambling
Definitions (粵典–words.hk)
動詞
克制自己唔去做出一啲行為 to restrain oneself from doing sth
佢哋嚟到香港，買嘢唔會忍手。
佢哋嚟到香港，买嘢唔会忍手。
keoi5 dei6 lai4 dou3 hoeng1 gong2, maai5 je5 m4 wui5 jan2 sau2. When they came to Hong Kong, they didn't restrain themselves from buying things.
個手袋好靚，我又忍唔到手喇。
个手袋好靓，我又忍唔到手喇。
go3 sau2 doi2 hou2 leng3, ngo5 jau6 jan2 m4 dou2 sau2 laa3. The handbag is good-looking. Again, I can't help (but buying it).