as an intransitive verb (followed by an infinitive with ‘to’): He doesn’t dare to complain. (without a following infinitive): She never went there on her own – she didn’t dare to.
as a modal verb (followed by an infinitive without ‘to’): No one dared speak. (without a following infinitive): Fight with him if you dare. When dare is a modal verb, the third person singular of the present tense does not end in ‘-s’. When dare is a modal verb, negatives and questions are formed without ‘do’, and the negative dare not can be shortened to daren’t in conversation and in informal writing: Dare he tell her the truth?He dare not/daren’t lie.
as a transitive verb (with an object usually followed by an infinitive with ‘to’): Someone dared him to climb the tree.
[intransitive] [never progressive]if you dare to do something, you are not afraid to do it, even though it may be dangerous or shocking or may cause trouble for you