The phrase "a vow to avoid" is correct and usable in written English.
You can use it when expressing a commitment or promise to refrain from a specific action or behavior.
Example: "After much reflection, she made a vow to avoid negative influences in her life."
Alternatives: "a promise to steer clear of" or "a commitment to refrain from".
More pointedly, she closed with a vow to avoid "the divisive politics of revenge and retribution".
Shannon capped his pitch with a vow to avoid ReplayTV's mistake of fighting Hollywood.
I came home feeling more than satisfied that I made the right choice, also with a vow to avoid eating as much as I did while traveling for business.
The president kicked off his remarks to the National Scout Jamboree with a vow to avoid politics, then went off script several times to urge GOP senators to pass an Obamacare repeal bill, complain about the "fake news" media and reminisce about his electoral victory.
Make a vow to avoid repeating them.
A weekend gathering in South Korea of officials from the Group of 20 economic powers ended Saturday with a collective vow to avoid a foreign-exchange war.
Even if Wilders were to come ahead, other relevant parties will not join a coalition that includes his extremist, xenophobic Freedom Party; they have all vowed to avoid it.
Written in a tone of gentle exhortation ("As you contemplate your biblical gardening projects, reflect on some of the things mankind has done to destroy our environment and vow to avoid them"), this slim guide is more of a history than a recipe book.
Did Obama actually win any undecided voters by promising, specifically, that "we'll have the negotiations televised on C-SPAN, so that people can see who is making arguments on behalf of their constituents, and who are making arguments on behalf of the drug companies or the insurance companies?" How about his vow to avoid raising taxes on anyone making less than $250,000 a year?
All Jain monks vow to avoid sexual relations, and the laity are encouraged to be chaste and even to become celibate after the birth of a son.
