The skull and crossbones were used as a poison label.
danger sign
Frequency:
75
%
The skull and crossbones on the bottle indicated a danger sign.
pirate flag
Frequency:
70
%
The pirate flag featured a skull and crossbones.
warning symbol
Frequency:
60
%
The skull and crossbones served as a warning symbol.
Idiomatic Expressions for skull and crossbones
Phrase: under the skull and crossbones
Meaning: to be under a pirate flag, typically implying danger or lawlessness
Usage: The small island was known for being a safe haven for criminals, operating under the skull and crossbones of a notorious pirate captain.