Undertake Un`der*take", v. i. 1. To take upon one's self, or assume, any business, duty, or province. [1913 Webster]

O Lord, I am oppressed; undertake for me. --Isa. xxxviii. 14. [1913 Webster]

2. To venture; to hazard. [Obs.] [1913 Webster]

It is the cowish terror of his spirit That dare not undertake. --Shak. [1913 Webster]

3. To give a promise or guarantee; to be surety. [1913 Webster]

But on mine honor dare I undertake For good lord Titus' innocence in all. --Shak. [1913 Webster]

The Collaborative International Dictionary of English. 2000.