noun
marriage of convenience
A marriage entered into for practical reasons such as legal status, financial benefit, or social convenience rather than love.
彼らはビザのために便宜結婚をした。
They entered into a marriage of convenience for a visa.
政略結婚 is a political marriage, often between powerful families, while 便宜結婚 is a marriage of convenience for practical personal gain.
Compound of 便宜 (convenience) and 結婚 (marriage).