skull and crossbones
Longman Dictionary of Contemporary English 5++LDOCE 5++ˌskull and ˈcrossbones noun [singular] 1. 
TTWa picture of a human skull with two bones crossed below it, used in past times on the flags of pirate ships 骷髅图〔旧时海盗旗图案〕2. DANGEROUSa picture of a human skull with two bones crossed below it, used on containers to show that what is inside is poison or very dangerous 骷髅图标志〔用于容器上，表示有毒或危险〕
TTWa picture of a human skull with two bones crossed below it, used in past times on the flags of pirate ships 骷髅图〔旧时海盗旗图案〕2. DANGEROUSa picture of a human skull with two bones crossed below it, used on containers to show that what is inside is poison or very dangerous 骷髅图标志〔用于容器上，表示有毒或危险〕Examples from the Corpus
skull and crossbones• All of the drums were marked with a little skull and crossbones symbol.• Remember the cigarettes with the skull and crossbones on the pack?ˌskull and ˈcrossbones nounChineseSyllable
human two a with below skull a picture crossed of bones Corpus
skull and crossbones
ˌskull and ˈcrossbones
noun [singular]
1. a picture of a human skull with two bones crossed below it, used in past times on the flags of pirate ships
2. a picture of a human skull with two bones crossed below it, used on containers to show that what is inside is poison or very dangerous
ˌskull and ˈcrossbones
noun [singular]1. a picture of a human skull with two bones crossed below it, used in past times on the flags of pirate ships
2. a picture of a human skull with two bones crossed below it, used on containers to show that what is inside is poison or very dangerous