To dream of a dagger indicates the ability to move out of an unhealthy situation with courage. A dagger also suggests a desire to be stronger and to say what you think instead of hiding your feelings. A dagger being used to defend the self within a dream may be significant in that it shows an unconscious strength and willingness to act in the interest of personal justice. A dagger being used against the self may indicate an emotional weakness in a situation that calls for your strength at this time.