noun
Refers to an organized refusal to buy goods or services, often as a protest or pressure tactic.
労働組合は会社に対して非買同盟を呼びかけた。
The labor union called for a boycott against the company.
ボイコット is a more general loanword for boycott, while 非買同盟 specifically emphasizes a purchasing boycott.
Compound of 非 (hi, 'non-') + 買 (bai, 'buying') + 同盟 (dōmei, 'alliance, union'), literally 'non-buying alliance'.