1) Accept as a challenge 2) Accept as a charge 3) Assume 4) Attempt 5) Begin 6) Deal with 7) Embark upon 8) Engage in 9) Enter into or upon 10) Exclusively Saxon word 11) Exclusively Anglo word 12) Initiate 13) Pioneer 14) Promise to do or accomplish 15) Promise to photograph less 16) See to 17) Set about 1) Achieve 2) Assume 3) Assure 4) Attempt 5) Experience 6) Setout 7) Set-to 8) Specify 9) Stipulate 10) Subvent 11) Swear 12) Try 13) Underwrite 14) Wage 
• (v. i.) To take upon one`s self, or assume, any business, duty, or province. • (v. i.) To venture; to hazard. • (v. t.) To take or have the charge of. • (v. t.) To have knowledge of; to hear. • (v. t.) Hence, to guarantee; to promise; to affirm. • (v. t.) To assume, as a character. • (v. t.) To take upon one`s s...
[v] - accept as a challenge 2. [v] - accept as a charge 3. [v] - enter upon an activity or enterprise 4. [v] - promise or guarantee
take on verb accept as a challenge; `I`ll tackle this difficult task`
accept as a challenge enter upon an activity or enterprise[Intelligent words] enter upon an activity or enterprise